JP4174574B2

JP4174574B2 - Hot water storage hot water source

Info

Publication number: JP4174574B2
Application number: JP2000135600A
Authority: JP
Inventors: 徹福知; 寿成酒井; 康人橋詰; 敏弘河内; 泰藤川; 善夫藤本; 謙治談議所; 智也崎石; 健一田之頭; 和也山口; 直司肆矢; 実希夫伊藤; 道憲川原
Original assignee: Saibu Gas Co Ltd; Osaka Gas Co Ltd; Toho Gas Co Ltd
Current assignee: Saibu Gas Co Ltd; Osaka Gas Co Ltd; Toho Gas Co Ltd
Priority date: 2000-05-09
Filing date: 2000-05-09
Publication date: 2008-11-05
Anticipated expiration: 2020-05-09
Also published as: JP2001317814A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯路が上部に接続された貯湯タンクと、その貯湯タンク内に湯水が温度成層を形成して貯湯されるように、貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を前記貯湯タンクの上部に供給する形態で湯水を循環させる貯湯運転状態と、前記加熱手段にて加熱した湯水の全量を外部放熱部に供給し、かつ、前記外部放熱部を通過した湯水の全量を前記貯湯タンクを迂回して前記加熱手段に直接戻す形態で湯水を循環させる放熱運転状態とに切り換え自在な湯水循環手段と、前記湯水循環手段の運転を制御する制御手段とが設けられた貯湯式の給湯熱源装置に関する。
【０００２】
【従来の技術】
上記貯湯式の給湯熱源装置は、貯湯運転状態においても、放熱運転状態においても、加熱手段の加熱機能を活用できるようにしたものであり、従来、例えば特開平９−８９３６９号公報に記載されているように、貯湯運転状態で湯水を循環させる貯湯循環路を、貯湯タンクを途中に設けた貯湯用湯水流路と、加熱手段と循環ポンプとを途中に設けた加熱用湯水流路とを閉ループ状に接続して構成し、外部放熱部を途中に設けた放熱用湯水流路を、貯湯循環路に貯湯用湯水流路と並列に接続するとともに、貯湯循環路と放熱用湯水流路との接続箇所に流路切り換え手段を設けて、貯湯運転状態で湯水を循環させるときは、放熱用湯水流路に湯水が流れないように流路を切り換え、放熱運転状態で湯水を循環させるときは、貯湯用湯水流路に湯水が流れないように流路を切り換えるように構成している。
【０００３】
【発明が解決しようとする課題】
この為、貯湯タンクに貯湯しながら、外部放熱部で放熱させる状態で湯水循環手段を運転することができず、使い勝手が悪い欠点がある。
本発明は上記実情に鑑みてなされたものであって、貯湯式の給湯熱源装置の使い勝手を向上できるようにすることを目的とする。
【０００４】
【課題を解決するための手段】
請求項１記載の発明の特徴構成は、給湯路が上部に接続され、かつ、水道水圧を用いて給水する給水路が底部に接続された貯湯タンクと、その貯湯タンク内に湯水が温度成層を形成して貯湯されるように、貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を前記貯湯タンクの上部に供給する形態で湯水を循環させる貯湯運転状態と、前記加熱手段にて加熱した湯水の全量を外部放熱部に供給し、かつ、前記外部放熱部を通過した湯水の全量を前記貯湯タンクを迂回して前記加熱手段に直接戻す形態で湯水を循環させる放熱運転状態とに切り換え自在な湯水循環手段と、前記湯水循環手段の運転を制御する制御手段とが設けられた貯湯式の給湯熱源装置であって、
前記湯水循環手段が、前記加熱手段にて加熱した湯水を前記貯湯タンクと前記外部放熱部とに分配供給し、かつ、前記外部放熱部を通過した湯水の全量を前記貯湯タンクを迂回して前記加熱手段に直接戻す形態で湯水を循環させる貯湯放熱並行運転状態に切り換え自在に構成され、前記給湯路の上流側を介して前記貯湯タンクに連通接続されて、前記加熱手段にて加熱した湯水を前記貯湯タンクの上部に供給する貯湯用湯水供給路と、前記加熱手段にて加熱した湯水を前記外部放熱部に供給する放熱用湯水供給路との各々に開閉弁が設けられ、前記制御手段が、前記貯湯用湯水供給路に設けた開閉弁と前記放熱用湯水供給路に設けた開閉弁とを周期的に択一的に開弁させることによって前記加熱手段にて加熱した湯水を前記貯湯タンクと外部放熱部とに分配供給して、前記貯湯放熱並行運転状態における前記湯水循環手段の運転を制御するように構成されている点にある。
〔作用〕
貯湯タンクに貯湯しながら、外部放熱部で放熱させるときは、湯水循環手段を、加熱手段にて加熱した湯水を貯湯タンクと外部放熱部とに分配供給し、かつ、外部放熱部を通過した湯水の全量を貯湯タンクを迂回して加熱手段に直接戻す形態で湯水を循環させる貯湯放熱並行運転状態に切り換え、加熱手段にて加熱した湯水を貯湯タンクの上部に供給する貯湯用湯水供給路に設けた開閉弁と、加熱手段にて加熱した湯水を外部放熱部に供給する放熱用湯水供給路に設けた開閉弁とを周期的に択一的に開弁させることによって、加熱手段にて加熱した湯水を貯湯タンクと外部放熱部とに分配供給して、貯湯タンクに貯湯しながら、外部放熱部で放熱させる貯湯放熱並行運転状態で運転することができる。
〔効果〕
湯水循環手段を、貯湯運転状態と放熱運転状態と貯湯放熱並行運転状態とに必要に応じて切り換えて運転することができ、貯湯式の給湯熱源装置の使い勝手を向上できる。
その上、貯湯用湯水供給路に設けた開閉弁と放熱用湯水供給路に設けた開閉弁とを周期的に択一的に開弁させて、貯湯用湯水供給路に設けた開閉弁が閉弁中で、かつ、放熱用湯水供給路に設けた開閉弁の開弁中に、湯水を外部放熱部に供給するので、必要量の湯水を外部放熱部へ確実に供給できる。
【０００５】
請求項２記載の発明の特徴構成は、前記貯湯運転状態で湯水を循環させる貯湯循環路が、前記貯湯タンクを途中に設けた貯湯用湯水流路と、前記加熱手段と循環ポンプとを途中に設けた加熱用湯水流路とを閉ループ状に接続して構成され、前記外部放熱部を途中に設けた放熱用湯水流路が、前記貯湯循環路に前記貯湯用湯水流路と並列に接続され、前記貯湯用湯水流路のうちの前記貯湯タンクよりも上流側の貯湯用湯水供給路と、前記放熱用湯水流路のうちの前記外部放熱部よりも上流側の放熱用湯水供給路との各々に、前記開閉弁が設けられ、前記制御手段が、前記開閉弁の開閉状態を調節して、前記湯水循環手段の運転状態を、前記貯湯運転状態と前記放熱運転状態と前記貯湯放熱並行運転状態とに切り換えるように構成されている点にある。
〔作用〕
湯水循環手段を貯湯運転状態で運転するときは、貯湯用湯水供給路に設けた開閉弁を開弁するとともに、放熱用湯水供給路に設けた開閉弁を閉弁することによって、貯湯タンクの底部から取り出した湯水を加熱手段にて加熱したのち、その温水を貯湯タンクの上部に供給する形態で湯水を循環させることができ、湯水循環手段を放熱運転状態で運転するときは、貯湯用湯水供給路に設けた開閉弁を閉弁するとともに、放熱用湯水供給路に設けた開閉弁を開弁することによって、加熱手段にて加熱した湯水の全量を外部放熱部に供給し、かつ、外部放熱部を通過した湯水の全量を貯湯タンクを迂回して加熱手段に直接戻す形態で湯水を循環させることができ、湯水循環手段を貯湯放熱並行運転状態で運転するときは、貯湯用湯水供給路に設けた開閉弁と放熱用湯水供給路に設けた開閉弁とを周期的に択一的に開弁させることによって、加熱手段にて加熱した湯水を貯湯タンクと外部放熱部とに分配供給し、かつ、外部放熱部を通過した湯水の全量を貯湯タンクを迂回して加熱手段に直接戻す形態で湯水を循環させることができる。
〔効果〕
貯湯運転状態においても、放熱運転状態においても、貯湯放熱並行運転状態においても、共通の加熱手段の加熱機能を活用でき、貯湯式の給湯熱源装置の構造を簡略化できる。
【０００６】
請求項３記載の発明の特徴構成は、前記制御手段が、前記貯湯タンクの上部に供給する湯水の温度が貯湯許可温度未満のときは、前記加熱手段にて加熱した湯水の全量を前記外部放熱部に供給して、前記貯湯放熱並行運転状態における前記湯水循環手段の運転を制御するように構成されている点にある。
〔作用〕
湯水循環手段を貯湯放熱並行運転状態で運転しているときに、貯湯タンクの上部に供給する湯水の温度が貯湯許可温度未満のときは、加熱手段にて加熱した湯水の全量を外部放熱部に供給することができる。
〔効果〕
貯湯タンクの上部に供給する湯水の温度が貯湯許可温度未満のときは、その湯水が貯湯タンクの上部に供給されて貯湯温度が下がってしまうことを防止しながら、加熱手段にて加熱した湯水の全量を外部放熱部に供給して効率良く放熱させることができる。
【０００７】
【発明の実施の形態】
本発明にかかる貯湯式の給湯熱源装置の実施の形態をエンジンヒートポンプ式冷暖房給湯システムに適用した例を図面に基づいて説明する。
このエンジンヒートポンプ式冷暖房給湯システムは、図１，図２に示すように、貯湯タンク１内に温度成層を形成して貯湯された湯水を給湯したり、貯湯タンク内１の湯水を加熱して外部放熱部２にて放熱したりする貯湯ユニットＡと、室内の冷暖房をするエンジンヒートポンプ式冷暖房装置Ｂとから構成されている。
【０００８】
前記貯湯ユニットＡは、この貯湯ユニットＡの運転を制御する貯湯ユニット制御部Ｃ、貯湯タンク１、貯湯タンク１内の湯水を循環ポンプＰ１の作動で循環させる循環路３を備えた湯水循環手段Ｅ、循環路３を通流する湯水を加熱する加熱手段としての加熱部４、循環路３を通流する湯水と熱交換して放熱する外部放熱部２などから構成されている。
そして、循環路３が、加熱部４と循環ポンプＰ１とを途中に設けた加熱用湯水流路９６と、外部放熱部２を途中に設けた放熱用湯水流路９７とを閉ループ状に接続して構成され、循環ポンプＰ１の作動で貯湯タンク１内の湯水を循環路３にて循環させながら、加熱部４にて加熱したり、外部放熱部２にて放熱したりできるようにしてある。
【０００９】
前記貯湯タンク１には、その底部から貯湯タンク１に水道水圧を用いて給水する給水路５が接続され、その上部から風呂場や台所などに給湯するための給湯路６が接続され、風呂場や台所などで使用された量だけの水を給水路５から貯湯タンク１に給水するように構成されている。
また、貯湯タンク１の内側には、貯湯タンク１内の湯水の温度を特定高さ位置にて検出する４個の温度センサとしての貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４が上下方向に分散配置して設けられている。
【００１０】
前記給湯路６には、給水路５から分岐された混合用給水路７が接続され、その接続箇所に給湯路６からの湯水と混合用給水路７からの水との混合比を調整自在なミキシングバルブ８が設けられている。
前記給水路５と混合用給水路７との分岐箇所には、給水温度を検出する給水サーミスタ９が設けられ、給水路５および混合用給水路７の夫々には、逆止弁１０が設けられている。
ちなみに、給湯路６には、オーバーフロー路１１が接続され、そのオーバーフロー路１１にエアー抜き弁１２が設けられている。
【００１１】
また、給湯路６におけるミキシングバルブ８よりも上流側には、貯湯タンク１の上部から給湯路６に給湯された湯水の温度を検出する貯湯出口サーミスタ１３が設けられ、給湯路６におけるミキシングバルブ８よりも下流側には、ミキシングバルブ８にて混合された湯水の温度を検出するミキシングサーミスタ１４、給湯路６の湯水の流量を調整する給湯用水比例バルブ１５が設けられている。
【００１２】
前記給湯用水比例バルブ１５よりも下流側の給湯路６が、台所や洗面所などの給湯栓に給湯する一般給湯路１６と、浴槽に湯水を供給するための湯張り路１７とに分岐され、湯張り路１７が浴槽からの風呂戻り路１８に接続され、風呂戻り路１８および風呂往き路１９の両路を通して浴槽に湯水を供給するようにしている。
前記一般給湯路１６には、一般給湯路１６を通流する湯水の流量を検出する給湯流量センサ２０が設けられ、湯張り路１７には、湯張り路１７を通流する湯水の流量を検出する湯張り流量センサ２１、湯張り電磁弁２２、バキュームブレーカ２３、湯張り逆止弁２４が上流側から順に設けられ、給湯流量センサ２０が一般給湯路１６における給湯流量を検出する給湯流量検出手段として設けられている。
【００１３】
前記循環路３と貯湯タンク１とが、循環路３を通流する湯水を貯湯タンク１内に戻す、または、貯湯タンク１内の湯水を循環路３に取り出すために、貯湯タンク１の上部１箇所と底部２箇所の合計３箇所で連通接続されている。
具体的に説明すると、貯湯タンク１の上部には、循環路３と貯湯タンク１とを接続する上部接続路２５が給湯路６の上流側を介して連通接続され、貯湯タンク１の底部には、循環路３を通流する湯水を給水路５の下流側を介して貯湯タンク１内の底部に戻す戻し路２６と、貯湯タンク１内の底部の湯水を循環路３に取り出す取り出し路２７とが連通接続されている。
【００１４】
そして、上部接続路２５には、電磁式の上部開閉弁２８が設けられ、戻し路２６には、戻し開閉弁２９が設けられ、上部開閉弁２８を開弁させることによって、循環路３を通流する湯水を貯湯タンク１内の上部に供給したり、貯湯タンク１内の上部の湯水を循環路３に取り出したりするようにし、戻し開閉弁２９を開弁させることによって、循環路３を通流する湯水を貯湯タンク１内の底部に戻すことができるようにしている。
ちなみに、取り出し路２７には、貯湯タンク１内の湯水を排水するための排水路３０が接続され、その排水路３０の途中部には、安全弁３１と手動バルブ３２とが並列に接続されている。
【００１５】
前記加熱部４は、エンジンヒートポンプ式冷暖房装置Ｂによる冷媒を供給して湯水を加熱するヒートポンプ式加熱器３３と、エンジンヒートポンプ式冷暖房装置Ｂのエンジン排熱を回収した冷却水を供給して湯水を加熱するエンジン排熱利用式加熱器３４と、バーナ３６の燃焼により湯水を加熱する補助加熱器３５とを設けて構成されている。
そして、循環路３の湯水の循環方向において上流側から順に、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４、補助加熱器３５が設けられている。
【００１６】
前記補助加熱器３５は、ガス燃焼式のバーナ３６に燃焼用空気を供給するファン３７などが設けられ、バーナ３６の燃焼により循環路３を通流する湯水を加熱するように構成されている。
前記バーナ３６に燃料ガスを供給する燃料供給路３８には、上流側から順にガスセフティ弁３９、ガス比例弁４０、ガスメイン弁４１が設けられている。
【００１７】
前記外部放熱部２は、循環路３を通流する湯水と暖房用の熱媒としての温水とを熱交換する暖房用熱交換部４２と、循環路３を通流する湯水と浴槽内の湯水とを熱交換して追焚きする風呂用熱交換部４３とを設けて構成されている。
そして、循環路３が、暖房用熱交換部４２を備えた暖房用循環路３ａと、風呂用熱交換部４３を備えた風呂用循環路３ｂとに分岐され、暖房用熱交換部４２と風呂用熱交換部４３とが並列に接続されている。
また、暖房用循環路３ａには、暖房用熱交換部４２よりも湯水の循環方向の上流側に電磁式の暖房用開閉弁４４が設けられ、風呂用循環路３ｂには、風呂用熱交換部４３よりも湯水の循環方向の上流側に電磁式の風呂用開閉弁４５が設けられている。
【００１８】
前記暖房用熱交換部４２には、暖房ポンプＰ２を作動させることにより、暖房戻り路４６および暖房往き路４７を通して循環する暖房用熱媒を、循環路３を通流する湯水にて加熱するように構成されている。
そして、暖房戻り路４６には、上流側から順に、暖房戻り路４６の暖房用熱媒の温度を検出する暖房戻りサーミスタ４８、補給水タンク４９、暖房ポンプＰ２が設けられ、暖房往き路４７には、暖房往き路４７の暖房用熱媒の温度を検出する暖房往きサーミスタ５０が設けられている。
【００１９】
前記補給水タンク４９には、水位の上限を検出する上限センサ５１と下限を検出する下限センサ５２とが設けられ、補給水タンク４９に給水するためのタンク給水路５３が接続され、そのタンク給水路５３には、補給水電磁弁５４が設けられている。
また、暖房戻り路４６の暖房用熱媒を暖房用熱交換部４２を迂回して暖房往き路４７に供給する暖房バイパス路５５が設けられている。
【００２０】
前記風呂用熱交換部４３は、風呂ポンプＰ３を作動させることにより、風呂戻り路１８および風呂往き路１９を通して循環する浴槽内の湯水を循環路３を通流する湯水にて加熱するように構成されている。
そして、風呂戻り路１８には、上流側から順に、浴槽内の湯水の水位を検出する水位センサ５６、風呂戻り路１８の湯水の温度を検出する風呂戻りサーミスタ５７、二方弁５８、風呂ポンプＰ３、風呂水流スイッチ５９が設けられている。
【００２１】
前記循環路３における戻り路２６との接続箇所と取り出し路２７との接続箇所との間には、外部放熱部２を通過した湯水のヒートポンプ式加熱器３３への通流を断続する電磁式のヒートポンプ用開閉弁６０が設けられ、エンジン排熱利用式加熱器３４と補助加熱器３５との間の部分に、補助加熱器３５に通流する湯水の温度を検出する入り温度サーミスタ６１、循環路３を通流する湯水の循環量Ｑを検出する循環量センサ６２、循環ポンプＰ１、補助加熱器３５への湯水の通流を断続する電磁式の補助用断続開閉弁６３が設けられている。
【００２２】
前記循環路３における補助用断続開閉弁６３と補助加熱器３５との間には、補助加熱器３５に通流する湯水の循環量Ｑを検出する水量センサ６４が設けられ、循環路３における補助加熱器３５と上部接続路２５との接続箇所との間には、循環路３を通流する湯水の循環量Ｑを調整する水比例バルブ６５、加熱部４にて加熱された後の循環路３の湯水の沸き上げ温度Ｔａを検出する貯湯サーミスタ６６が設けられている。
【００２３】
また、循環路３には、外部放熱部２を通過した湯水をヒートポンプ式加熱器３３を迂回してエンジン排熱利用式加熱器３４に流入させるためのヒートポンプ用バイパス路６７と、エンジン排熱利用式加熱器３４を通過した湯水を補助加熱器３５を迂回して循環させるための補助用バイパス路６８とが接続され、ヒートポンプ用バイパス路６７には、電磁式のヒートポンプバイパス開閉弁６９が設けられ、補助用バイパス路６８には、電磁式の補助バイパス開閉弁７０が設けられている。
【００２４】
そして、湯水循環手段Ｅが、循環路３、上部接続路２５、戻し路２６、取り出し路２７、循環ポンプＰ１、および、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、戻し開閉弁２９、ヒートポンプ用開閉弁６０、ヒートポンプバイパス開閉弁６９、補助用断続開閉弁６３、補助バイパス開閉弁７０などにより構成され、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、戻し開閉弁２９、ヒートポンプ用開閉弁６０、ヒートポンプバイパス開閉弁６９、補助用断続開閉弁６３、補助バイパス開閉弁７０の開閉操作により、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態の貯湯初期運転状態で湯水を循環させる貯湯初期運転と、貯湯タンク１内に湯水が温度成層を形成して貯湯されるように、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態の貯湯運転状態で湯水を循環させる貯湯運転と、加熱部４にて加熱した湯水を外部放熱部２に供給し、かつ、外部放熱部２を通過した湯水の全量を貯湯タンク１を迂回して加熱部４に直接戻す形態の放熱運転状態で湯水を循環させる放熱運転とに切り換え自在に構成されている。
【００２５】
また、循環調整手段Ｆが、給水サーミスタ９，入り温度サーミスタ６１，循環量センサ６２，水比例バルブ６５、貯湯サーミスタ６６，貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４などにより構成され、貯湯タンク１に貯湯してある湯水を給湯路６を通して給湯する給湯手段Ｇが、貯湯出口サーミスタ１３、ミキシングバルブ８、給湯用水比例バルブ１５、給湯流量センサ２０、湯張り流量センサ２１、湯張り電磁弁２２などにより構成され、風呂操作手段Ｈが、水位センサ５６、風呂戻りサーミスタ５７、二方弁５８、風呂ポンプＰ３、風呂水流スイッチ５９などで構成され、暖房操作手段Ｊが、暖房戻りサーミスタ４８、暖房ポンプＰ２、暖房往きサーミスタ５０などで構成され、湯水循環手段Ｅにて貯湯タンク１の上部に供給される湯水の供給流量を検出する供給流量検出手段が、循環量センサ６２で構成されている。
【００２６】
従って、貯湯タンク１を途中に設けた貯湯用湯水流路９８が、上部接続路２５と取り出し路２７とで構成され、貯湯運転状態で湯水を循環させる貯湯循環路が、貯湯用湯水流路９８と加熱用湯水流路９６とを閉ループ状に接続して構成され、放熱用湯水流路９７が、貯湯循環路に貯湯用湯水流路９８と並列に接続されている。
また、貯湯用湯水流路９８のうちの貯湯タンク１よりも上流側の貯湯用湯水供給路である上部接続路２５には上部開閉弁２８が設けられ、放熱用湯水流路９７のうちの外部放熱部２よりも上流側の放熱用湯水供給路９９である、暖房用循環路３ａの暖房用熱交換部４２よりも上流側には暖房用開閉弁４４が設けられ、風呂用循環路３ｂのうちの風呂用熱交換部４３よりも上流側には風呂用開閉弁４５が設けられている。
【００２７】
前記貯湯ユニット制御部Ｃは、湯水循環手段Ｅの運転を制御することにより、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の底部に戻したり、貯湯タンク１の底部から取り出した湯水を加熱部４にて加熱したのち、その温水を貯湯タンク１の上部に戻したり、循環路３を加熱部４と外部放熱部２とに亘って循環させたりするように構成されている。
【００２８】
前記エンジンヒートポンプ式冷暖房装置Ｂは、複数の室内機７１と室外機７２とを備えて、複数の空調対象空間を空調することができるように構成され、室内機７１と室外機７２と貯湯ユニットＡにおけるヒートポンプ式加熱器３３とが冷媒配管７３で接続され、エンジンヒートポンプ式冷暖房装置Ｂにおける冷媒をヒートポンプ式加熱器３３に供給できるように構成されている。
前記複数の室内機７１の夫々には、室内熱交換器７５、その室内熱交換器７５で温調した空気を空調対象空間へ送出する室内空調用送風機７６などが備えられている。
【００２９】
前記室外機７２には、電子膨張弁７４，８９、ガスエンジン７７、ガスエンジン７７にて駆動される冷媒圧縮機７８、アキュムレータ７９、四方弁８０、室外熱交換器８１、その室外熱交換器８２に対し外気を通風する室外空調用送風機８２、ラジエータ８３、ラジエータ用送風機８４、ヒートポンプ運転制御部Ｄなどが備えられている。
また、ガスエンジン７７の冷却用の冷却水をラジエータ８３との間で循環させる冷却水路８５が設けられ、この冷却水路８５にラジエター用ポンプＰ４とエンジン出口側での冷却水温度を検出する冷却水温度サーミスタ９５が設けられ、ガスエンジン７７の排熱を回収した冷却水を、加熱用冷却水路９１を通してエンジン排熱利用式加熱器３４に供給する加熱状態と、ラジエータ８３に供給して放熱される放熱状態とに切り換え自在な排熱切換機構８６が設けられている。
【００３０】
そして、ヒートポンプ運転手段Ｋが、ガスエンジン７７、電子膨張弁７４，８９、室内空調用送風機７６、冷媒圧縮機７８、四方弁８０、室外空調用送風機８２、低圧側の冷媒圧力を検出する低圧検出手段８７、高圧側の冷媒圧力を検出する高圧検出手段８８などにより構成され、冷却水循環手段Ｌが、冷却水路８５、加熱用冷却水路９１、ラジエータ用ポンプＰ４、ラジエータ用送風機８４、排熱切換機構８６、冷却水温度サーミスタ９５などにより構成されている。
【００３１】
前記貯湯ユニット制御部Ｃとヒートポンプ運転制御部Ｄとは、エンジンヒートポンプ式冷暖房装置Ｂが空調運転中であることや、エンジンヒートポンプ式冷暖房装置Ｂへの駆動要求などの制御信号を送受信可能に構成にされ、図３に示すように、空調対象空間としての各部屋に設置されている空調リモコン９３および貯湯リモコン９２の指令に基づいて、空調対象空間への空調冷房運転や空調暖房運転などの空調運転、貯湯タンク１内に湯水を貯湯する貯湯運転、外部放熱部２にて放熱する放熱運転、貯湯タンク１内の貯湯量が最低確保量未満のときに給湯する給湯優先運転などの運転制御を実行するように構成されている。
【００３２】
前記エンジンヒートポンプ式冷暖房装置Ｂの運転について説明すると、空調リモコン９３から空調冷房要求や空調暖房要求などの空調要求があると、ヒートポンプ運転制御部Ｄがヒートポンプ運転手段Ｋおよび冷却水循環手段Ｌの運転を制御し、空調リモコン９３による空調要求に基づいて、ガスエンジン７７により圧縮機７８を作動させて、四方弁８０の切換え操作により空調冷房運転と空調暖房運転とを選択切換え、室内機７１の電子膨張弁７４の開閉制御により、各空調対象空間への空調を切り換えて、ヒートポンプ運転手段Ｋを制御するように構成されている。
【００３３】
すなわち、ヒートポンプ運転制御部Ｄは、空調リモコン９３から空調冷房要求があると、空調冷房要求がある部屋に相当する電子膨張弁７４を開状態にして、室内熱交換器７５を蒸発器として機能させて、空調対象空間への供給空気を冷却温調し、室外熱交換器８１を凝縮器として機能させて外気に対して放熱させるように、ヒートポンプ運転手段Ｋを制御して空調冷房運転を実行する。
また、ヒートポンプ運転制御部Ｄは、空調リモコン９３から空調暖房要求があると、空調暖房要求がある部屋に相当する電子膨張弁７４を開状態にして、室内熱交換器７５を凝縮器として機能させて、空調対象空間への供給空気を加熱温調し、室外熱交換器８１を蒸発器として機能させて外気から吸熱させるように、ヒートポンプ運転手段Ｋを制御して空調暖房運転を実行する。
【００３４】
尚、ヒートポンプ運転制御部Ｄは、空調冷房運転においても、空調暖房運転においても、冷媒圧力が設定目標圧力になるように、冷媒圧縮機７８の回転速度を、検出した冷媒圧力と設定目標圧力との偏差に基づいてフィードバック制御し、その制御における時定数は充分大きく設定されていて、回転速度の増減変更は緩やかな速度で行われる。
【００３５】
そして、冷却水循環手段Ｌは、空調冷房運転において、ラジエータ用ポンプＰ４を作動させ、ラジエータ用送風機８４を作動させラジエータ８３にて放熱させるようにし、エンジン排熱利用式加熱器３４にて加熱可能なときには、冷却水路８５を通流する冷却水が加熱用設定温度以上になると、排熱切換機構８６を加熱状態に切り換えて、冷却水をエンジン排熱利用式加熱器３４に供給するようにしている。
また、空調暖房運転において、ラジエータ用ポンプＰ４を作動させ、ラジエータ用送風機８４を作動させラジエータ８３にて放熱させるようにし、エンジン排熱利用式加熱器３４にて加熱可能なときには、暖房負荷が小さくかつ冷却水路８５を通流する冷却水が加熱用設定温度以上になると、排熱切換機構８６を加熱状態に切り換えて、冷却水をエンジン排熱利用式加熱器３４に供給するようにしている。
【００３６】
前記空調冷房運転においては、室内熱交換器７５を蒸発器として機能させて空調対象空間への供給空気を冷却温調し、室外熱交換器８１を凝縮器として機能させて外気に対して放熱するようにしている。
この空調冷房運転では、ヒートポンプ運転制御部Ｄは、低圧検出手段８７の検出情報に基づいて、その検出圧力が冷房用の目標圧力になるようにガスエンジン７７の回転速度を制御するようにしている。
また、空調冷房運転において、ヒートポンプ運転制御部Ｄは、排熱切換機構８６を加熱状態に切り換えて冷却水をエンジン排熱利用式加熱器３４に供給し、循環路３を通流する湯水をエンジン排熱で加熱するようにしている。
【００３７】
前記空調冷房運転における冷媒の流れについて説明を加えると、冷媒圧縮機７８から吐出される高圧乾き蒸気冷媒を、四方弁８０を介して室外熱交換器８１に供給し、この室外熱交換器８１において外気との熱交換により凝縮される。
そして、室外熱交換器８１から送出される凝縮工程通過冷媒を、電子膨張弁７４を介して室内熱交換器７５に供給し、この室内熱交換器７５において冷却対象空気との熱交換により蒸発される。
その後、室内熱交換器７５から送出される低圧乾き蒸気冷媒を、四方弁８０およびアキュムレータ７９を介して冷媒圧縮機７８の吸入口に戻す。
【００３８】
前記空調暖房運転においては、室内熱交換器７５を凝縮器として機能させて空調対象空間への供給空気を加熱温調し、室外熱交換器８１を蒸発器として機能させて外気から吸熱するようにしている。
この空調暖房運転では、ヒートポンプ運転制御部Ｄは、高圧検出手段８８の検出情報に基づいて、その検出圧力が暖房用の目標圧力になるようにガスエンジン７７の回転速度を制御するようにしている。
また、この空調暖房運転において、加熱用冷媒配管９０を通してヒートポンプ式加熱器３３に高圧冷媒を供給する加熱用運転により、循環路３を通流する湯水を加熱するようにしている。
【００３９】
前記空調暖房運転における冷媒の流れについて説明を加えると、電子膨張弁７４，８９が所定開度になるように制御する初期制御を行い、高圧検出手段８８の検出圧力が目標圧力になるように、ガスエンジン７７の回転数を増減して、冷媒圧縮機７８の回転速度を制御し、冷媒圧縮機７８から吐出される高圧乾き蒸気冷媒を、四方弁８０を介して室内熱交換器７５およびヒートポンプ式加熱器３３に供給し、室内熱交換器７５においては加熱対象空気との熱交換により凝縮され、ヒートポンプ式加熱器３３においては循環路３の湯水との熱交換により凝縮される。
【００４０】
そして、室内熱交換器７５から送出される凝縮工程通過冷媒を、電子膨張弁７４を介して室外熱交換器８１に供給するとともに、ヒートポンプ式加熱器３３から送出される凝縮工程通過冷媒を、電子膨張弁８９を介して室外熱交換器８１に供給して、この室外熱交換器８１において外気との熱交換により蒸発される。
その後、室外熱交換器８１から送出される低圧乾き蒸気冷媒を四方弁８０およびアキュムレータ７９を介して冷媒圧縮機７８の吸入口に戻す。
【００４１】
尚、電子膨張弁７４，８９の初期制御が完了したあとは、室内熱交換器７５やヒートポンプ式加熱器３３の下流側における冷媒温度を冷媒温度センサ９６で検出して、この検出温度が飽和液温度から所定値を引いた目標温度になるように、電子膨張弁７４，８９の開度を調整するサブクール制御を実行する。
つまり、サブクール制御は、室内熱交換器７５やヒートポンプ式加熱器３３で凝縮して放熱し、その結果、冷却された冷媒の温度を冷媒温度センサ９６で検出して、その検出温度が、高圧検出手段８８で検出した検出圧力を基にして予めメモリに記憶されているデータから求まる飽和液温度よりも、所定値( サブクール値) だけ低くなるように電子膨張弁７４，８９の開度を調整する。
【００４２】
そして、飽和液温度から所定値を引いた目標温度に対して冷媒温度センサ９６による検出温度が高いほど、電子膨張弁７４，８９の開度を小さくすることにより、冷媒の循環量が減少して、その分、所定冷媒量当たりの放熱量が増加して冷媒温度センサ９６による検出温度が低下し、かつ、高圧検出手段８８による検出圧力が増加して飽和液温度が上昇して、冷媒温度センサ９６による検出温度を目標温度と略同等にすることができる。
また、目標温度に対して冷媒温度センサ９６による検出温度が低いほど、電子膨張弁７４，８９の開度を大きくすることにより、冷媒の循環量が増加して、その分、所定冷媒量当たりの放熱量が減少して冷媒温度センサ９６による検出温度が上昇し、かつ、高圧検出手段８８による検出圧力が減少して飽和液温度が低下して、冷媒温度センサ９６による検出温度を目標温度と略同等にすることができる。
【００４３】
また、貯湯ユニット制御部Ｃには、貯湯タンク１内の貯湯量を検出する貯湯量検出手段Ｍや、貯湯タンク１に貯湯する目標貯湯量を設定する目標貯湯量設定手段Ｎなどが設けられている。
前記貯湯量検出手段Ｍと目標貯湯量設定手段Ｎはプログラム形式で設けられ、貯湯量検出手段Ｍは、貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４のうちで貯湯設定温度Ｔｅ以上の温度を検出する最下位の貯湯温度サーミスタがいずれの貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４であるかにより、その貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４の検出位置に対応する量として予め設定されている量の湯水を貯湯量として検出するように構成され、目標貯湯量設定手段Ｎは、４個の貯湯温度サーミスタＳ１，Ｓ２，Ｓ３，Ｓ４のいずれかに対応する貯湯量を目標貯湯量として設定するように構成されている。
【００４４】
そして、最上部の貯湯温度サーミスタＳ１に対応する貯湯量が最低確保量として、上から２番目の貯湯温度サーミスタＳ２に対応する貯湯量が小貯湯量として、上から３番目の貯湯温度サーミスタＳ３に対応する貯湯量が中貯湯量として、また、最下部の貯湯温度サーミスタＳ４に対応する貯湯量が最大貯湯量として、夫々、予め設定されている。
尚、本実施形態では、最低確保量が１７リットル、小貯湯量が３０リットル、中貯湯量が７０リットル、最大貯湯量が１１３リットルとして設定されている。
【００４５】
次に、貯湯ユニットＡの運転について説明すると、貯湯リモコン９２の要求指令やヒートポンプ運転手段Ｋの運転状態などに基づいて、貯湯ユニット制御部Ｃが、湯水循環手段Ｅ、循環調整手段Ｆ、給湯手段Ｇ、風呂操作手段Ｈ、暖房操作手段Ｊ、補助加熱器３４の夫々の運転を制御して、貯湯運転、放熱運転、および、給湯優先運転などの運転を実行するように構成されている。
【００４６】
前記湯水循環手段Ｅについて具体的に説明すると、この湯水循環手段Ｅは、貯湯タンク１に湯水を貯湯するときに、貯湯運転状態としてのヒートポンプ貯湯運転状態( 以下、ＨＰ貯湯運転状態という) 、排熱貯湯運転状態および補助加熱貯湯運転状態、貯湯初期運転状態としてのヒートポンプ貯湯初期運転状態( 以下、ＨＰ貯湯初期運転状態という) 、排熱貯湯初期運転状態および補助加熱貯湯初期運転状態の夫々に切り換えられ、外部放熱部２にて放熱するときに、放熱運転状態としての追焚き単独運転状態、暖房単独運転状態、追焚き・暖房同時運転状態、貯湯タンク１に湯水を貯湯しながら外部放熱部２にて放熱する貯湯放熱並行運転状態の夫々に切り換えられるように構成されている。
【００４７】
そして、貯湯タンク１に湯水を貯湯するときには、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４または補助加熱器３５にて加熱された湯水の温度が貯湯許容温度に満たないときには、ＨＰ貯湯初期運転状態、排熱貯湯初期運転状態または補助加熱貯湯初期運転状態に切り換えて貯湯タンク１内の湯水を循環させ、ヒートポンプ式加熱器３３、エンジン排熱利用式加熱器３４または補助加熱器３５にて加熱された湯水の温度が貯湯許容温度になると、ＨＰ貯湯運転状態、排熱貯湯運転状態または補助加熱貯湯運転状態に切り換えて貯湯タンク１に貯湯するようにしている。
【００４８】
また、外部放熱部２にて放熱するときには、追焚き要求のみの要求があると、追焚き単独運転状態に切り換え、暖房要求のみの要求があると、暖房単独運転状態に切り換え、追焚き要求および暖房要求の両要求があると、追焚き・暖房同時運転状態に切り換え、追焚き単独運転中に貯湯量が最低確保量未満の状態で給湯されると、貯湯放熱並行運転状態としての貯湯・追焚き同時運転状態に切り換え、暖房単独運転中に貯湯量が最低確保量未満の状態で給湯されると、貯湯放熱並行運転状態としての貯湯・暖房同時運転状態に切り換え、追焚き・暖房同時運転中に貯湯量が最低確保量未満の状態で給湯されると、貯湯放熱並行運転状態としての貯湯・追焚き・暖房同時運転状態に切り換えるようにしている。
【００４９】
以下、湯水循環手段Ｅの夫々の状態について説明を加える。
なお、この湯水循環手段Ｅの夫々の状態における説明において、上部開閉弁２８、戻し開閉弁２９、暖房用開閉弁４４、風呂用開閉弁４５、ヒートポンプ用開閉弁６０、補助用断続開閉弁６３、ヒートポンプバイパス開閉弁６９，および、補助バイパス開閉弁７０の開閉状態について、開弁させる開閉弁のみを記載し、記載していない開閉弁については閉弁させるものとする。
【００５０】
前記ＨＰ貯湯運転状態においては、上部開閉弁２８および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水をヒートポンプ式加熱器３３にて加熱したのち、その温水を補助加熱器３５を迂回して貯湯タンク１の上部に戻すようにしている。
【００５１】
前記排熱貯湯運転状態においては、上部開閉弁２８および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を補助加熱器３５を迂回して貯湯タンク１の上部に戻すようにしている。
【００５２】
前記補助加熱貯湯運転状態においては、上部開閉弁２８および補助用断続開閉弁６３を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１内に湯水が温度成層を形成して貯湯させるように、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の上部に戻すようにしている。
【００５３】
前記ＨＰ貯湯初期状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水をヒートポンプ式加熱器３３にて加熱したのち、その湯水を補助加熱器３５を迂回して貯湯タンク１の底部に戻すようにしている。
【００５４】
前記排熱貯湯初期運転状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その湯水を補助加熱器３５を迂回して貯湯タンク１の底部に戻すようにしている。
【００５５】
前記補助加熱貯湯初期運転状態においては、戻し開閉弁２９、暖房用開閉弁４４および補助用断続開閉弁６３を開弁させるとともに、循環ポンプＰ１を作動させ、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その湯水を貯湯タンク１の底部に戻すようにしている。
【００５６】
前記追焚き単独運転状態においては、ヒートポンプ式加熱器３３にて加熱するときは、風呂用開閉弁４５、ヒートポンプ用開閉弁６０および補助バイパス開閉弁７０を開弁させるとともに、循環ポンプＰ１を作動させて、ヒートポンプ式加熱器３３にて加熱された温水の全量を風呂用熱交換部４３にて放熱させたのち、その風呂用熱交換部４３を通過した湯水の全量を貯湯タンク１を迂回してヒートポンプ式加熱器３３に戻し、補助加熱器３５にて加熱するときは、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させて、補助加熱器３５にて加熱された温水の全量を風呂用熱交換部４３にて放熱させたのち、その風呂用熱交換部４３を通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻すようにしている。
【００５７】
前記暖房単独運転状態においては、暖房用開閉弁４４、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水の全量を暖房用熱交換部４２にて放熱させたのち、その暖房用熱交換部４２を通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻すようにしている。
前記追焚き・暖房同時運転状態においては、暖房用開閉弁４４、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水の全量を風呂用熱交換部４３および暖房用熱交換部４２にて放熱させたのち、その風呂用熱交換部４３と暖房用熱交換部４２とを通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して補助加熱器３５に戻すようにしている。
【００５８】
前記貯湯・追焚き同時運転状態においては、上部開閉弁２８、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水を貯湯タンク１と風呂用熱交換部４３とに分配供給して、貯湯タンク１の上部に貯湯しながら、風呂用熱交換部４３に供給した湯水を放熱させたのち、その風呂用熱交換部４３を通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して、貯湯タンク１の底部から取り出した湯水に合流させる状態で補助加熱器３５に戻すようにしている。
【００５９】
前記貯湯・暖房同時運転状態においては、上部開閉弁２８、暖房用開閉弁４４、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水を貯湯タンク１と暖房用熱交換部４２とに分配供給して、貯湯タンク１の上部に貯湯しながら、暖房用熱交換部４２に供給した湯水を放熱させたのち、その暖房用熱交換部４２を通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して、貯湯タンク１の底部から取り出した湯水に合流させる状態で補助加熱器３５に戻すようにしている。
【００６０】
前記貯湯・追焚き・暖房同時運転状態においては、上部開閉弁２８、暖房用開閉弁４４、風呂用開閉弁４５、補助用断続開閉弁６３およびヒートポンプバイパス開閉弁６９を開弁させるとともに、循環ポンプＰ１を作動させ、補助加熱器３５にて加熱された温水を貯湯タンク１と暖房用熱交換部４２と風呂用熱交換部４３とに分配供給して、貯湯タンク１の上部に貯湯しながら、暖房用熱交換部４２と風呂用熱交換部４３とに供給した湯水を放熱させたのち、その暖房用熱交換部４２と風呂用熱交換部４３とを通過した湯水の全量を貯湯タンク１とヒートポンプ式加熱器３３とを迂回して、貯湯タンク１の底部から取り出した湯水に合流させる状態で補助加熱器３５に戻すようにしている。
【００６１】
前記貯湯ユニットＡの制御動作について、図４〜１２のフローチャートに基づいて説明する。
前記貯湯ユニットＡは、図４のフローチャートに示すように、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行し、貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
そして、暖房要求や追焚き要求などの放熱要求があると、放熱運転を実行し、貯湯要求があると、貯湯運転を実行し、エンジンヒートポンプ式冷暖房装置Ｂが運転中で、エンジン排熱を回収した冷却水の温度が所定温度以上であれば、排熱貯湯運転を実行する。
【００６２】
前記給湯優先運転は、貯湯タンク１の貯湯量が最低確保量未満のときに、給湯栓などに給湯するときに実行され、湯水循環手段Ｅを補助加熱貯湯運転状態に切り換え、補助加熱器３５にて加熱された湯水を上部接続路２５から給湯路６に給湯しながら、給湯目標温度、貯湯出口サーミスタ１３および給水サーミスタ９の検出情報に基づいて、給湯する湯水の温度が給湯目標温度になるようにミキシングバルブ８の開度を調整するとともに、ミキシングサーミスタ１４の検出情報に基づいて、その検出温度と給湯目標温度との偏差に基づいてミキシングバルブ８の開度を微調整することにより、給湯目標温度の湯水を給湯するようにしている。
【００６３】
ちなみに、浴槽に湯張りを行うときには、給湯優先運転と同様に、貯湯タンク１の貯湯量が最低確保量未満のときに、給湯栓などに給湯するときに実行され、給湯目標温度、貯湯出口サーミスタ１３および給水サーミスタ９の検出情報に基づいて、給湯する湯水の温度が給湯目標温度になるようにミキシングバルブ８の開度を調整するとともに、ミキシングサーミスタ１４の検出情報に基づいて、その検出温度と給湯目標温度との偏差に基づいてミキシングバルブ８の開度を微調整するとともに、湯張り電磁弁２２を開弁させ、ミキシングバブル８にて給湯目標温度に調整された湯水を風呂戻り路１８および風呂往き路１９の両路から浴槽に供給し、浴槽内に湯張り設定量の湯水が供給されると、湯張り電磁弁２２を閉弁させるようにしている。
【００６４】
前記放熱運転の制御動作について、図５のフローチャートに基づいて説明を加えると、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行する。
貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
【００６５】
そして、追焚き要求がありかつ暖房要求がないときには、追焚き運転を実行し、追焚き要求および暖房要求の両要求があるときには、追焚き・暖房運転を実行し、追焚き要求がなくかつ暖房要求があるときには、暖房運転を実行する。
このようにして、追焚き要求および暖房要求のいずれかまたは両方が要求されているかによって、その要求に応えるべく、追焚き運転、暖房運転、追焚き・暖房運転の夫々の運転を実行し、追焚き要求および暖房要求のいずれかまたは両方が満たされて要求が完了すると、湯水循環手段Ｅおよび補助加熱器３５の運転を停止させる放熱停止処理を実行する。
【００６６】
前記追焚き運転は、図６のフローチャートに示すように、給湯栓が開操作されて給湯中で、かつ、貯湯タンク１の貯湯量が最低確保量未満であれば貯湯・追焚き同時運転を実行し、給湯中でないときや、給湯中であっても貯湯量が最低確保量以上であれば、追焚き単独運転を実行する。
前記暖房運転は、図７のフローチャートに示すように、給湯栓が開操作されて給湯中で、かつ、貯湯タンク１の貯湯量が最低確保量未満であれば貯湯・暖房同時運転を実行し、給湯中でないときや、給湯中であっても貯湯量が最低確保量以上であれば、暖房単独運転を実行する。
前記追焚き・暖房運転は、図８のフローチャートに示すように、給湯栓が開操作されて給湯中で、かつ、貯湯タンク１の貯湯量が最低確保量未満であれば貯湯・追焚き・暖房同時運転を実行し、給湯中でないときや、給湯中であっても貯湯量が最低確保量以上であれば、追焚き・暖房同時運転を実行する。
【００６７】
前記追焚き単独運転について具体的に説明すると、湯水循環手段Ｅを追焚き単独運転状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が追焚き用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して循環させる。
そして、風呂用熱交換部４３にて浴槽内の湯水を加熱して追焚きし、風呂戻りサーミスタ５７の検出温度が追焚き用設定温度以上になると、風呂ポンプＰ３の作動を停止するとともに、補助加熱器３５の運転および湯水循環手段Ｅの運転を停止させる。
【００６８】
前記暖房単独運転について具体的に説明すると、湯水循環手段Ｅを暖房単独運転状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が暖房用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して循環させ、暖房用熱交換部４２にて熱媒を加熱して暖房端末に供給するようにしている。
【００６９】
前記追焚き・暖房同時運転について具体的に説明すると、湯水循環手段Ｅを追焚き・暖房同時運転状態に切り換え、かつ、貯湯サーミスタ６６による検出温度が追焚き・暖房同時用設定温度になるようにファン３７の回転速度およびガス比例弁４０の開度を調整するとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して循環させ、かつ、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して循環させる。
そして、浴槽の湯水を追焚きするとともに、暖房端末に暖房用熱交換部４２にて加熱された熱媒を供給するようにしている。
【００７０】
前記貯湯・追焚き同時運転は、図９のフローチャートに示すように、湯水循環手段Ｅを貯湯・追焚き同時運転状態に切り換えて、循環ポンプＰ１を作動させるとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して循環させる( ステップ＃１〜＃３) 。
そして、補助加熱器３５を一定出力（３４０kcal/min( 約１．４３×１０⁶Ｊ/min))で運転して、循環量が貯湯サーミスタ６６による検出温度が貯湯許可温度Ｔｂとなる循環量になるように水比例バルブ６５の開度を調整するとともに、上部開閉弁２８と風呂用開閉弁４５とを追焚き負荷に応じて、つまり、追焚き負荷が大きいほど風呂用開閉弁４５の開弁時間の割合が大きくなるように周期的に択一的に開弁させる開閉弁開閉作動により、補助加熱器３５にて加熱した湯水を貯湯タンク１と風呂用熱交換部４３とに分配供給する( ステップ＃４，＃５) 。
また、貯湯タンク１の上部に供給する湯水の温度、つまり、貯湯サーミスタ６６による検出温度Ｔａが貯湯許可温度Ｔｂ未満のときは、上部開閉弁２８を閉弁して、補助加熱器３５にて加熱した湯水の全量を風呂用熱交換部４３に供給して、追焚き単独運転を優先させる状態で、貯湯放熱並行運転状態における湯水循環手段Ｅの運転を制御するように構成されている( ステップ＃６，＃７) 。
【００７１】
前記貯湯・暖房同時運転は、図１０のフローチャートに示すように、湯水循環手段Ｅを貯湯・暖房同時運転状態に切り換えて、循環ポンプＰ１を作動させるとともに、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して循環させる( ステップ＃１１〜＃１３) 。
そして、補助加熱器３５を一定出力( ３４０kcal/min( 約１．４３×１０⁶Ｊ/min))で運転して、循環量が貯湯サーミスタ６６による検出温度が貯湯許可温度Ｔｂとなる循環量になるように水比例バルブ６５の開度を調整するとともに、上部開閉弁２８と暖房用開閉弁４４とを暖房負荷に応じて、つまり、暖房負荷が大きいほど暖房用開閉弁４４の開弁時間の割合が大きくなるように周期的に択一的に開弁させる開閉弁開閉作動により、補助加熱器３５にて加熱した湯水を貯湯タンク１と暖房用熱交換部４２とに分配供給する( ステップ＃１４，＃１５) 。
また、貯湯タンク１の上部に供給する湯水の温度、つまり、貯湯サーミスタ６６による検出温度Ｔａが貯湯許可温度Ｔｂ未満のときは、上部開閉弁２８を閉弁して、助加熱器３５にて加熱した湯水の全量を暖房用熱交換部４２に供給して、暖房単独運転を優先させる状態で、貯湯放熱並行運転状態における湯水循環手段Ｅの運転を制御するように構成されている( ステップ＃１６，＃１７) 。
【００７２】
前記貯湯・追焚き・暖房同時運転は、図１１のフローチャートに示すように、湯水循環手段Ｅを貯湯・追焚き・暖房同時運転状態に切り換えて、循環ポンプＰ１を作動させるとともに、風呂ポンプＰ３を作動させて浴槽内の湯水を風呂戻り路１８および風呂往き路１９を通して循環させ、暖房ポンプＰ２を作動させて暖房端末からの熱媒を暖房戻り路４６および暖房往き路４７を通して循環させる( ステップ＃２１〜＃２３) 。
そして、補助加熱器３５を一定出力( ３４０kcal/min( 約１．４３×１０⁶Ｊ/min))で運転して、循環量が貯湯サーミスタ６６による検出温度が貯湯許可温度Ｔｂとなる循環量になるように水比例バルブ６５の開度を調整するとともに、上部開閉弁２８と、風呂用開閉弁４５及び暖房用開閉弁４４とを追焚き負荷と暖房負荷との合計負荷に応じて、つまり、合計負荷が大きいほど風呂用開閉弁４５及び暖房用開閉弁４４の開弁時間の割合が大きくなるように周期的に択一的に開弁させる開閉弁開閉作動により、補助加熱器３５にて加熱した湯水を貯湯タンク１と暖房用熱交換部４２と風呂用熱交換部４３とに分配供給する( ステップ＃２４，＃２５) 。
また、貯湯タンク１の上部に供給する湯水の温度、つまり、貯湯サーミスタ６６による検出温度Ｔａが貯湯許可温度Ｔｂ未満のときは、上部開閉弁２８を閉弁して、助加熱器３５にて加熱した湯水の全量を暖房用熱交換部４２と風呂用熱交換部４３とに供給して、追焚き・暖房同時運転を優先させる状態で、貯湯放熱並行運転状態における湯水循環手段Ｅの運転を制御するように構成されている( ステップ＃２６，＃２７) 。
【００７３】
前記貯湯運転の制御動作について、図１２のフローチャートに基づいて説明を加えると、貯湯タンク１の貯湯量が最低確保量未満であって、かつ、給湯栓が開操作されて給湯中であると、給湯優先運転を実行する。
貯湯タンク１の貯湯量が最低確保量以上であるか、給湯中でなければ、給湯優先運転を実行していると、補助加熱器３５の運転および循環ポンプＰ１の作動を停止させて給湯優先運転停止処理を実行する。
そして、追焚き要求または暖房要求のいずれかの放熱要求があると、放熱運転を実行し、放熱要求がないときは貯湯運転制御を実行して、貯湯タンク１の貯湯量が目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、エンジンヒートポンプ式冷暖房装置Ｂまたは加熱部４の運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる貯湯運転停止処理を実行する。
【００７４】
前記貯湯運転制御は、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中であるか否かにより、ヒートポンプ貯湯運転( 以下、ＨＰ貯湯運転という) または補助加熱貯湯運転のいずれかを選択して実行され、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中に貯湯リモコン９２から指令される加熱要求としての貯湯要求があると、補助加熱器３５を運転させて貯湯する補助加熱貯湯運転を実行させて補助加熱優先運転を実行し、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中ではないときに貯湯要求があると、エンジンヒートポンプ式冷暖房装置Ｂを空調暖房運転させて貯湯するＨＰ貯湯運転を実行させてヒートポンプ優先運転を実行するように構成されている。
【００７５】
そして、エンジンヒートポンプ式冷暖房装置Ｂが空調暖房運転中に空調リモコン９３からの空調暖房要求が解除された状態において、貯湯要求があると、エンジンヒートポンプ式冷暖房装置Ｂの運転を継続したままＨＰ貯湯運転を実行するように構成されている。
また、ＨＰ貯湯運転中に、エンジンヒートポンプ式冷暖房装置Ｂへの空調暖房要求があると、ガスエンジン７７の回転速度や暖房要求されている部屋の暖房負荷などに基づいて、ＨＰ貯湯運転を継続している状態でのエンジンヒートポンプ式冷暖房装置Ｂの空調能力が空調負荷に対して余裕があるのか不足しているのかを判別し、空調能力に余裕があるときには、ＨＰ貯湯運転を継続するとともに、エンジンヒートポンプ式冷暖房装置Ｂにて空調暖房運転させる空調追加運転を実行し、空調能力が不足しているときには、ＨＰ貯湯運転から補助加熱貯湯運転に切り換えかつエンジンヒートポンプ式冷暖房装置Ｂにて空調暖房運転させるように構成されている。
【００７６】
前記貯湯運転におけるＨＰ貯湯運転について具体的に説明すると、まず、エンジンヒートポンプ式冷暖房装置Ｂを暖房運転させて高圧冷媒をヒートポンプ式加熱器３３に供給するとともに、湯水循環手段ＥをＨＰ貯湯初期運転状態にて運転させ、貯湯タンク１内の湯水をヒートポンプ式加熱器３３にて加熱させる。
そして、貯湯サーミスタ６６にて検出される温度が貯湯許容温度以上になると、湯水循環手段ＥをＨＰ貯湯初期運転状態からＨＰ貯湯運転状態に切り換えるとともに、貯湯タンク１の上部に貯湯される温水の温度が貯湯設定温度となるように、貯湯サーミスタ６６の検出情報に基づいて循環用水比例バルブ６５の開度を調整するようにしている。
【００７７】
このようにして、貯湯タンク１内の湯水が温度成層を形成しながら貯湯され、貯湯タンク１の貯湯量が貯湯リモコン９２などにより設定された目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、エンジンヒートポンプ式冷暖房装置Ｂの運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる。
ちなみに、目標貯湯量は、「少」、「中」、「満」のうちのひとつが選択でき、例えば、目標貯湯量として「中」が選択されているときには、中部サーミスタＳ３が貯湯設定温度よりも設定温度だけ低い温度を検出すると、貯湯タンク１の貯湯量が目標貯湯量になっていると検出するようにしている。
【００７８】
前記貯湯運転における補助加熱貯湯運転について具体的に説明すると、まず、湯水循環手段Ｅを補助加熱貯湯初期運転状態に切り換えて、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の底部に戻す補助加熱貯湯初期運転と、湯水循環手段Ｅを補助加熱貯湯運転状態に切り換えて、貯湯タンク１の底部から取り出した湯水を補助加熱器３５にて加熱したのち、その温水を貯湯タンク１の上部に供給する補助加熱貯湯運転とに切り換えて貯湯される。
【００７９】
つまり、貯湯ユニット制御部Ｃは、貯湯用目標温度Ｔｂよりも８℃高い温度を越える沸き上げ温度Ｔａ、又は、貯湯用目標温度Ｔｂよりも１５℃低い温度を越える沸き上げ温度Ｔａが貯湯サーミスタ６６により１秒間継続して検出されるまで、補助加熱貯湯初期運転状態にて湯水を１リットル/minの循環量Ｑで循環させる補助加熱貯湯初期運転を行い、貯湯用目標温度Ｔｂよりも８℃高い温度を越える沸き上げ温度Ｔａ、又は、貯湯用目標温度Ｔｂよりも１５℃低い温度を越える沸き上げ温度Ｔａが１秒間継続して検出されると、補助加熱貯湯運転状態に切り換えて、沸き上げ温度Ｔａが貯湯用目標温度Ｔｂになるように循環量Ｑを制御するように構成されている。
【００８０】
このようにして、貯湯タンク１内の湯水が温度成層を形成しながら貯湯され、貯湯タンク１の貯湯量が貯湯リモコン９２などにより設定された目標貯湯量になると、設定時間貯湯タンク１への貯湯を継続したのち、補助加熱器３５の運転を停止させるとともに、循環ポンプＰ１の作動を停止させかつ開弁している開閉弁を閉弁させて湯水循環手段Ｅの運転を停止させる。
【００８１】
前記排熱貯湯運転は、エンジンヒートポンプ式冷暖房装置Ｂの運転中においてそのエンジン排熱を利用して貯湯するもので、排熱貯湯初期運転状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の底部に戻す形態で湯水を循環させる排熱貯湯初期運転と、排熱貯湯運転状態に切り換えて、貯湯タンク１の底部から取り出した湯水をエンジン排熱利用式加熱器３４にて加熱したのち、その温水を貯湯タンク１の上部に供給する形態で湯水を循環させる排熱貯湯運転とに切り換えて貯湯される。
【００８２】
〔その他の実施形態〕
１．上記実施形態では、補助加熱器にて加熱した湯水を貯湯タンクと外部放熱部とに分配供給する構成を示したが、ヒートポンプ式加熱器やエンジン排熱利用式加熱器を併用して加熱した湯水や、ヒートポンプ式加熱器又はエンジン排熱利用式加熱器で加熱した湯水を貯湯タンクと外部放熱部とに分配供給しても良い。
２．上記実施形態では、複数の熱交換部を並列に接続してある外部放熱部を設けて、各熱交換部毎にその上流側に開閉弁を設ける構成を示したが、複数の熱交換部を直列に接続してある外部放熱部を設けて、その外部放熱部の上流側に開閉弁を設けても良い。
３．上記実施形態では、放熱運転において貯湯運転の必要が生じた場合に、貯湯放熱並行運転状態で湯水循環手段の運転を制御する構成を示したが、貯湯運転において放熱運転の必要が生じた場合に、貯湯放熱並行運転状態で湯水循環手段の運転を制御するようにしても良い。
【図面の簡単な説明】
【図１】貯湯式の給湯熱源装置( 貯湯ユニット) の概略構成図
【図２】貯湯式の給湯熱源装置( エンジンヒートポンプ式冷暖房装置) の概略構成図
【図３】制御ブロック図
【図４】制御動作を示すフローチャート
【図５】制御動作を示すフローチャート
【図６】制御動作を示すフローチャート
【図７】制御動作を示すフローチャート
【図８】制御動作を示すフローチャート
【図９】制御動作を示すフローチャート
【図１０】制御動作を示すフローチャート
【図１１】制御動作を示すフローチャート
【図１２】制御動作を示すフローチャート
【符号の説明】
１貯湯タンク
２外部放熱部
４加熱手段
６給湯路
２５貯湯用湯水供給路
２８開閉弁
４４開閉弁
４５開閉弁
９６加熱用湯水流路
９７放熱用湯水流路
９８貯湯用湯水流路
９９放熱用湯水供給路
Ｃ制御手段
Ｅ湯水循環手段
Ｐ１循環ポンプ
Ｔａ湯水の温度
Ｔｂ貯湯許可温度[0001]
BACKGROUND OF THE INVENTION
The present invention heats hot water taken out from the bottom of the hot water storage tank with heating means so that the hot water storage tank is connected to the upper part of the hot water supply passage, and hot water is stored in the hot water storage tank by forming a temperature stratification. After that, the hot water is circulated in a form in which the hot water is supplied to the upper part of the hot water storage tank, and the entire amount of hot water heated by the heating means is supplied to the external heat radiating portion and passes through the external heat radiating portion. Hot water circulating means that can be switched to a heat radiation operation state in which hot water is circulated in such a manner that the entire amount of hot water bypasses the hot water storage tank and returns directly to the heating means, and a control means that controls the operation of the hot water circulating means. The present invention relates to a hot water storage heat source device provided.
[0002]
[Prior art]
The above hot water storage type hot water supply heat source device can utilize the heating function of the heating means both in the hot water storage operation state and in the heat radiation operation state, and is conventionally described in, for example, Japanese Patent Application Laid-Open No. 9-89369. As shown, the hot water circulation path for circulating hot water in the hot water storage state is closed loop with the hot water flow path for hot water provided with a hot water storage tank and the hot water flow path for heating provided with a heating means and a circulation pump. The hot water flow path for heat radiation having an external heat radiating part provided in the middle is connected in parallel with the hot water flow path for hot water storage in the hot water storage circuit, and between the hot water storage circuit and the hot water flow path for heat radiation. When the channel switching means is provided at the connection location and hot water is circulated in the hot water storage operation state, the flow channel is switched so that hot water does not flow into the heat radiating hot water flow channel, and when hot water is circulated in the heat radiation operation state, Hot water in the hot water flow path for hot water storage It is configured to switch the flow path so that it does not flow.
[0003]
[Problems to be solved by the invention]
For this reason, the hot water circulation means cannot be operated in a state where the hot water is radiated by the external heat radiating portion while hot water is stored in the hot water storage tank.
This invention is made | formed in view of the said situation, Comprising: It aims at enabling it to improve the usability of a hot water storage type hot-water supply heat source apparatus.
[0004]
[Means for Solving the Problems]
The characteristic configuration of the invention described in claim 1 is that the hot water supply path is connected to the upper part. And a water supply channel that uses tap water pressure is connected to the bottom. The hot water taken out from the bottom of the hot water storage tank is heated by heating means so that the hot water is stored in the hot water storage tank by forming a temperature stratification, and then the hot water is put on the upper part of the hot water storage tank. A hot water storage operation state in which hot water is circulated in a supply form, the entire amount of hot water heated by the heating means is supplied to the external heat radiating portion, and the total amount of hot water that has passed through the external heat radiating portion is bypassed the hot water storage tank. This is a hot water storage type hot water supply heat source device provided with hot water circulation means that can be switched to a heat radiation operation state in which hot water is circulated in a form that is directly returned to the heating means, and a control means that controls the operation of the hot water circulation means. And
The hot water circulating means distributes and supplies hot water heated by the heating means to the hot water storage tank and the external heat radiating section, and bypasses the hot water storage tank with the total amount of hot water passing through the external heat radiating section. It is configured to be freely switchable to a hot water storage heat radiation parallel operation state in which hot water is circulated in the form of returning directly to the heating means, Connected to the hot water storage tank via the upstream side of the hot water supply path, The hot water supply path for supplying hot water heated by the heating means to the upper part of the hot water storage tank and the hot water supply path for heat dissipation supplying hot water supplied by the heating means to the external heat radiating section are opened and closed. A valve is provided, and the control means is for storing the hot water. Hot water On-off valve provided in the supply path and for heat dissipation Hot water The hot water heated by the heating means is distributed and supplied to the hot water storage tank and the external heat radiating portion by periodically opening and closing the on-off valve provided in the supply path, and the hot water storage heat dissipation parallel operation state Is configured to control the operation of the hot water circulating means.
[Action]
When storing heat in the hot water storage tank and dissipating heat from the external heat radiating section, the hot water circulating means distributes and supplies hot water heated by the heating means to the hot water storage tank and the external heat radiating section, and passes through the external heat radiating section. Switch to the hot water storage heat radiation parallel operation state in which hot water is circulated in a form that bypasses the hot water tank and returns directly to the heating means, and is provided in the hot water supply passage for hot water that supplies hot water heated by the heating means to the upper part of the hot water tank The heating means was heated by periodically opening the on-off valve and the on-off valve provided in the radiating hot water supply path for supplying hot water heated by the heating means to the external heat radiating section. The hot water can be distributed and supplied to the hot water storage tank and the external heat radiating unit, and the hot water can be operated in a hot water storage and heat radiation parallel operation state in which heat is radiated by the external heat radiating unit while hot water is stored in the hot water storage tank.
〔effect〕
The hot water circulation means can be operated by switching between the hot water storage operation state, the heat radiation operation state, and the hot water storage heat radiation parallel operation state as required, and the usability of the hot water storage type hot water supply heat source device can be improved.
In addition, the open / close valve provided in the hot water supply passage for hot water storage and the open / close valve provided in the hot water supply passage for heat radiation are periodically opened alternatively, Hot water storage Hot water is supplied to the external heat radiating section while the on-off valve provided in the hot water supply path is closed and the open / close valve provided in the radiating hot water supply path is open, so the required amount of hot water is radiated to the outside. Can be reliably supplied to the part.
[0005]
According to a second aspect of the present invention, there is provided a hot water circulation path for circulating hot water in the hot water storage operation state, including a hot water flow path for hot water storage provided with the hot water storage tank in the middle, the heating means and the circulation pump. The heating hot water flow path provided is connected in a closed loop shape, and the heat radiating hot water flow path provided with the external heat radiating portion in the middle is connected to the hot water storage circulation path in parallel with the hot water storage hot water flow path. A hot water supply path for hot water storage upstream of the hot water storage tank in the hot water storage flow path for hot water storage, and a hot water supply path for heat dissipation upstream of the external heat dissipating part in the hot water flow path for heat dissipation. Each is provided with the opening / closing valve, and the control means adjusts the opening / closing state of the opening / closing valve to change the operation state of the hot water circulation means to the hot water storage operation state, the heat dissipation operation state, and the hot water storage heat dissipation parallel operation. It is configured to switch to the state That.
[Action]
When the hot water circulation means is operated in the hot water storage state, the bottom of the hot water storage tank is opened by opening the open / close valve provided in the hot water supply passage for hot water and closing the open / close valve provided in the hot water supply passage for heat dissipation. After the hot water taken out from the hot water is heated by the heating means, the hot water can be circulated in the form of supplying the hot water to the upper part of the hot water storage tank. When operating the hot water circulation means in the heat dissipation operation state, supply hot water for hot water storage The on-off valve provided on the passage is closed and the on-off valve provided on the heat-dissipating hot water supply passage is opened, so that the entire amount of hot water heated by the heating means is supplied to the external heat radiating section and the external heat dissipation is performed. Hot water can be circulated in such a way that the entire amount of hot water that has passed through the section is returned directly to the heating means, bypassing the hot water storage tank, and when the hot water circulation means is operated in the hot water storage heat radiation parallel operation state, Provided Distributing and supplying hot water heated by the heating means to the hot water storage tank and the external heat radiating unit by periodically opening and closing the valve and the on-off valve provided in the hot water supply passage for heat radiation, and Hot water can be circulated in such a form that the entire amount of hot water that has passed through the external heat radiating portion is bypassed the hot water storage tank and directly returned to the heating means.
〔effect〕
The heating function of the common heating means can be utilized in the hot water storage operation state, the heat radiation operation state, and the hot water storage heat radiation parallel operation state, and the structure of the hot water storage type hot water supply heat source device can be simplified.
[0006]
According to a third aspect of the present invention, when the temperature of the hot water supplied to the upper part of the hot water storage tank is lower than the permitted hot water storage temperature, the control means transfers the total amount of hot water heated by the heating means to the external heat dissipation. The hot water circulation means is configured to control the operation of the hot water circulation means in the hot water storage heat radiation parallel operation state.
[Action]
When the hot water circulation means is operating in the hot water storage heat radiation parallel operation state, if the temperature of the hot water supplied to the upper part of the hot water storage tank is lower than the allowable hot water storage temperature, the total amount of hot water heated by the heating means is transferred to the external heat dissipation section. Can be supplied.
〔effect〕
When the temperature of the hot water supplied to the upper part of the hot water storage tank is lower than the hot water storage allowable temperature, the hot water heated by the heating means is prevented while the hot water is supplied to the upper part of the hot water tank and the hot water temperature is not lowered. The entire amount can be supplied to the external heat radiating portion to efficiently dissipate heat.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An example in which an embodiment of a hot water storage type hot water supply heat source apparatus according to the present invention is applied to an engine heat pump type air conditioning and hot water supply system will be described with reference to the drawings.
As shown in FIGS. 1 and 2, this engine heat pump type air conditioning and hot water supply system supplies hot water stored in a hot water storage tank 1 by forming a temperature stratification, or heats the hot water in the hot water storage tank 1 to the outside. It is comprised from the hot water storage unit A which radiates heat in the thermal radiation part 2, and the engine heat pump type | formula air conditioning apparatus B which cools and heats indoors.
[0008]
The hot water storage unit A includes a hot water storage unit controller C for controlling the operation of the hot water storage unit A, a hot water storage tank 1, and hot water circulation means E provided with a circulation path 3 for circulating hot water in the hot water storage tank 1 by the operation of the circulation pump P1. The heating unit 4 serves as a heating means for heating hot water flowing through the circulation path 3, the external heat radiation unit 2 radiates heat by exchanging heat with hot water flowing through the circulation path 3, and the like.
And the circulation path 3 connects the heating hot water flow path 96 provided in the middle with the heating part 4 and the circulation pump P1, and the radiating hot water flow path 97 provided in the middle with the external heat radiation part 2 in a closed loop shape. The hot water in the hot water storage tank 1 is circulated in the circulation path 3 by the operation of the circulation pump P1, and can be heated by the heating unit 4 or radiated by the external heat radiating unit 2.
[0009]
The hot water storage tank 1 is connected to a hot water supply path 5 for supplying water to the hot water storage tank 1 from the bottom using tap water pressure, and is connected to a hot water supply path 6 for supplying hot water to a bathroom or kitchen from the upper part. It is configured to supply only the amount of water used in the kitchen or the like from the water supply channel 5 to the hot water storage tank 1.
Inside the hot water storage tank 1, hot water storage temperature thermistors S1, S2, S3, and S4 as four temperature sensors for detecting the temperature of the hot water in the hot water storage tank 1 at a specific height position are distributed in the vertical direction. Is provided.
[0010]
The hot water supply path 6 is connected to a mixing water supply path 7 branched from the water supply path 5, and the mixing ratio of the hot water from the hot water supply path 6 and the water from the mixing water supply path 7 can be adjusted to the connection location. A mixing valve 8 is provided.
A water supply thermistor 9 for detecting the water supply temperature is provided at a branch point between the water supply passage 5 and the mixing water supply passage 7, and a check valve 10 is provided in each of the water supply passage 5 and the mixing water supply passage 7. ing.
Incidentally, an overflow passage 11 is connected to the hot water supply passage 6, and an air vent valve 12 is provided in the overflow passage 11.
[0011]
Further, on the upstream side of the mixing valve 8 in the hot water supply passage 6, a hot water storage outlet thermistor 13 for detecting the temperature of the hot water supplied to the hot water supply passage 6 from the upper part of the hot water storage tank 1 is provided, and the mixing valve 8 in the hot water supply passage 6 is provided. On the further downstream side, a mixing thermistor 14 for detecting the temperature of hot and cold water mixed by the mixing valve 8 and a hot water supply proportional valve 15 for adjusting the flow rate of hot water in the hot water supply path 6 are provided.
[0012]
The hot water supply passage 6 downstream of the hot water proportional valve 15 is branched into a general hot water supply passage 16 for supplying hot water to a hot water tap such as a kitchen or a washroom, and a hot water supply passage 17 for supplying hot water to the bathtub, A hot water supply path 17 is connected to a bath return path 18 from the bathtub, and hot water is supplied to the bathtub through both the bath return path 18 and the bath return path 19.
The general hot water supply path 16 is provided with a hot water flow rate sensor 20 that detects the flow rate of hot water flowing through the general hot water supply path 16, and the hot water supply path 17 detects the flow rate of hot water flowing through the hot water supply path 17. A hot water flow rate sensor 21, a hot water solenoid valve 22, a vacuum breaker 23, and a hot water check valve 24 are provided in order from the upstream side, and the hot water flow rate sensor 20 detects the hot water flow rate detection means for detecting the hot water flow rate in the general hot water supply path 16. It is provided as.
[0013]
The circulation path 3 and the hot water storage tank 1 allow the hot water flowing through the circulation path 3 to be returned to the hot water storage tank 1, or the hot water in the hot water storage tank 1 is taken into the circulation path 3 so that the upper part 1 of the hot water storage tank 1. It is connected in communication at a total of three locations, two locations and two bottom portions.
Specifically, an upper connection path 25 that connects the circulation path 3 and the hot water storage tank 1 is connected to the upper part of the hot water storage tank 1 through the upstream side of the hot water supply path 6. A return path 26 for returning hot water flowing through the circulation path 3 to the bottom of the hot water storage tank 1 via the downstream side of the water supply path 5, and an extraction path 27 for taking out hot water at the bottom of the hot water storage tank 1 to the circulation path 3. Are connected.
[0014]
The upper connection path 25 is provided with an electromagnetic upper opening / closing valve 28, and the return path 26 is provided with a return opening / closing valve 29. By opening the upper opening / closing valve 28, the circulation path 3 is passed through. The circulating hot water is supplied to the upper part of the hot water storage tank 1, the hot water in the upper part of the hot water storage tank 1 is taken out to the circulation path 3, and the return on-off valve 29 is opened to pass through the circulation path 3. The flowing hot water can be returned to the bottom of the hot water storage tank 1.
Incidentally, a drainage passage 30 for draining hot water in the hot water storage tank 1 is connected to the extraction passage 27, and a safety valve 31 and a manual valve 32 are connected in parallel to the middle portion of the drainage passage 30. .
[0015]
The heating unit 4 supplies the coolant from the engine heat pump air conditioner B to heat the hot water and supplies the cooling water recovered from the exhaust heat of the engine heat pump air conditioner B to supply the hot water. An engine exhaust heat utilization type heater 34 for heating and an auxiliary heater 35 for heating hot water by combustion of a burner 36 are provided.
A heat pump heater 33, an engine exhaust heat utilization heater 34, and an auxiliary heater 35 are provided in this order from the upstream side in the hot water circulation direction of the circulation path 3.
[0016]
The auxiliary heater 35 is provided with a fan 37 for supplying combustion air to the gas combustion type burner 36 and the like, and is configured to heat hot water flowing through the circulation path 3 by combustion of the burner 36.
A gas supply valve 38 for supplying fuel gas to the burner 36 is provided with a gas safety valve 39, a gas proportional valve 40, and a gas main valve 41 in order from the upstream side.
[0017]
The external heat radiating unit 2 includes a heating heat exchanging unit 42 for exchanging heat between hot water flowing through the circulation path 3 and hot water as a heating medium, and hot water flowing through the circulation path 3 and hot water in the bathtub. And a bath heat exchanging portion 43 for exchanging and exchanging heat with each other.
Then, the circulation path 3 is branched into a heating circulation path 3a having a heating heat exchange section 42 and a bath circulation path 3b having a bath heat exchange section 43, and the heating heat exchange section 42 and the bath The heat exchanging unit 43 is connected in parallel.
The heating circulation path 3a is provided with an electromagnetic heating on / off valve 44 upstream of the heating heat exchange section 42 in the hot water circulation direction, and the bath circulation path 3b has a bath heat exchange. An electromagnetic bath opening / closing valve 45 is provided upstream of the portion 43 in the hot water circulation direction.
[0018]
In the heating heat exchanging unit 42, the heating heat medium circulating through the heating return path 46 and the heating outgoing path 47 is heated by hot water flowing through the circulation path 3 by operating the heating pump P2. It is configured.
The heating return path 46 is provided with a heating return thermistor 48 that detects the temperature of the heating heat medium in the heating return path 46, a makeup water tank 49, and a heating pump P 2 in order from the upstream side. Is provided with a heating thermistor 50 that detects the temperature of the heating medium in the heating path 47.
[0019]
The replenishing water tank 49 is provided with an upper limit sensor 51 for detecting the upper limit of the water level and a lower limit sensor 52 for detecting the lower limit, and a tank water supply path 53 for supplying water to the replenishing water tank 49 is connected. A supply water electromagnetic valve 54 is provided in the path 53.
In addition, a heating bypass path 55 is provided for supplying the heating medium of the heating return path 46 to the heating forward path 47 by bypassing the heating heat exchanging section 42.
[0020]
The bath heat exchanging unit 43 is configured to heat the hot water in the bathtub circulating through the bath return path 18 and the bath going-out path 19 with hot water flowing through the circulation path 3 by operating the bath pump P3. Has been.
The bath return path 18 includes, in order from the upstream side, a water level sensor 56 that detects the level of hot water in the bathtub, a bath return thermistor 57 that detects the temperature of hot water in the bath return path 18, a two-way valve 58, and a bath pump. P3 and a bath water flow switch 59 are provided.
[0021]
Between the connection point of the return path 26 and the connection point of the extraction path 27 in the circulation path 3, an electromagnetic type that intermittently flows the hot water that has passed through the external heat radiating unit 2 to the heat pump heater 33. A heat pump opening / closing valve 60 is provided, and an inlet temperature thermistor 61 for detecting the temperature of hot water flowing through the auxiliary heater 35, a circulation path between the engine exhaust heat utilization type heater 34 and the auxiliary heater 35. 3 is provided with a circulation amount sensor 62 for detecting the circulation amount Q of hot water flowing through 3, an circulation pump P1, and an electromagnetic auxiliary on / off valve 63 for intermittently supplying hot water to the auxiliary heater 35.
[0022]
Between the auxiliary intermittent opening / closing valve 63 and the auxiliary heater 35 in the circulation path 3, a water amount sensor 64 for detecting a circulation amount Q of hot water flowing through the auxiliary heater 35 is provided. Between the connection part of the heater 35 and the upper connection path 25, the water proportional valve 65 which adjusts the circulation amount Q of the hot water flowing through the circulation path 3, and the circulation path after being heated by the heating unit 4 A hot water storage thermistor 66 for detecting the boiling temperature Ta of the hot water 3 is provided.
[0023]
The circulation path 3 includes a heat pump bypass path 67 for allowing hot water that has passed through the external heat radiating section 2 to bypass the heat pump heater 33 and flow into the engine exhaust heat utilization heater 34, and engine exhaust heat utilization. An auxiliary bypass path 68 for circulating hot water passing through the heater 34 bypassing the auxiliary heater 35 is connected, and an electromagnetic heat pump bypass opening / closing valve 69 is provided in the heat pump bypass path 67. The auxiliary bypass path 68 is provided with an electromagnetic auxiliary bypass opening / closing valve 70.
[0024]
Then, the hot water circulation means E includes the circulation path 3, the upper connection path 25, the return path 26, the take-out path 27, the circulation pump P1, the upper on-off valve 28, the heating on-off valve 44, the bath on-off valve 45, and the return on-off. The valve 29, the heat pump on-off valve 60, the heat pump bypass on-off valve 69, the auxiliary intermittent on-off valve 63, the auxiliary bypass on-off valve 70, and the like, and the upper on-off valve 28, the heating on-off valve 44, the bath on-off valve 45, the return The hot water extracted from the bottom of the hot water storage tank 1 is heated by the heating unit 4 by opening and closing the on-off valve 29, the heat pump on-off valve 60, the heat pump bypass on-off valve 69, the auxiliary intermittent on-off valve 63, and the auxiliary bypass on-off valve 70. The hot water is then circulated in the hot water storage tank 1 and the hot water initial operation in which the hot water is circulated in the hot water initial operation state in which the hot water is returned to the bottom of the hot water tank 1. Hot water extracted from the bottom of the hot water storage tank 1 is heated by the heating unit 4 so that the hot water is formed and stored, and the hot water is circulated in a hot water storage operation state in which the hot water is supplied to the upper part of the hot water storage tank 1. Operation and heat radiation operation in which hot water heated by the heating unit 4 is supplied to the external heat radiating unit 2 and all the hot water that has passed through the external heat radiating unit 2 is directly returned to the heating unit 4 by bypassing the hot water storage tank 1 It is configured to be switchable to a heat radiation operation for circulating hot water in a state.
[0025]
The circulation adjusting means F includes a water supply thermistor 9, an incoming temperature thermistor 61, a circulation amount sensor 62, a water proportional valve 65, a hot water storage thermistor 66, a hot water storage temperature thermistor S 1, S 2, S 3, S 4, etc. A hot water supply means G for supplying hot water stored in the hot water through the hot water supply path 6 is constituted by a hot water outlet thermistor 13, a mixing valve 8, a hot water proportional valve 15, a hot water flow sensor 20, a hot water flow sensor 21, a hot water solenoid valve 22, and the like. The bath operation means H is composed of a water level sensor 56, a bath return thermistor 57, a two-way valve 58, a bath pump P3, a bath water flow switch 59, and the like. The heating operation means J is a heating return thermistor 48, a heating pump P2. Hot water supplied to the upper portion of the hot water storage tank 1 by the hot water circulation means E. Supply flow rate detection means for detecting a supply flow rate of, and a circulation rate sensor 62.
[0026]
Accordingly, the hot water storage water passage 98 provided with the hot water storage tank 1 in the middle is constituted by the upper connection passage 25 and the take-out passage 27, and the hot water storage circulation passage for circulating hot water in the hot water storage operation state is the hot water storage hot water passage 98. And a hot water flow channel 96 for heating are connected in a closed loop. , Release A hot water flow path 97 is connected to the hot water circulation path in parallel with the hot water flow path 98 for hot water storage.
An upper opening / closing valve 28 is provided in the upper connection path 25 which is a hot water storage hot water supply path upstream of the hot water storage tank 1 in the hot water storage water flow path 98. A heating on / off valve 44 is provided on the upstream side of the heating heat exchange section 42 of the heating circulation path 3a, which is the radiating hot water supply path 99 upstream of the heat radiation section 2, and the bath circulation path 3b A bath on-off valve 45 is provided upstream of the bath heat exchanging unit 43.
[0027]
The hot water storage unit control unit C controls the operation of the hot water circulation means E so that the hot water taken out from the bottom of the hot water storage tank 1 is heated by the heating unit 4 and then returned to the bottom of the hot water storage tank 1. After the hot water taken out from the bottom of the hot water storage tank 1 is heated by the heating unit 4, the hot water is returned to the upper part of the hot water storage tank 1 or the circulation path 3 is circulated between the heating unit 4 and the external heat radiating unit 2. It is configured so that.
[0028]
The engine heat pump air conditioner B includes a plurality of indoor units 71 and an outdoor unit 72, and is configured to air-condition a plurality of air-conditioning target spaces. The indoor unit 71, the outdoor unit 72, and the hot water storage unit A The heat pump type heater 33 is connected by a refrigerant pipe 73 so that the refrigerant in the engine heat pump type air conditioner B can be supplied to the heat pump type heater 33.
Each of the plurality of indoor units 71 includes an indoor heat exchanger 75, an indoor air conditioner blower 76 that sends out the temperature-controlled air in the indoor heat exchanger 75 to the air-conditioning target space, and the like.
[0029]
The outdoor unit 72 includes electronic expansion valves 74 and 89, a gas engine 77, a refrigerant compressor 78 driven by the gas engine 77, an accumulator 79, a four-way valve 80, an outdoor heat exchanger 81, and an outdoor heat exchanger 82 thereof. Are provided with an outdoor air-conditioning blower 82, a radiator 83, a radiator blower 84, a heat pump operation control unit D, and the like.
A cooling water passage 85 for circulating cooling water for cooling the gas engine 77 to and from the radiator 83 is provided. The cooling water passage 85 detects the cooling water temperature at the radiator pump P4 and the engine outlet side. A temperature thermistor 95 is provided, and the cooling water in which the exhaust heat of the gas engine 77 is recovered is supplied to the engine exhaust heat utilization type heater 34 through the heating cooling water passage 91 and is supplied to the radiator 83 to be radiated. An exhaust heat switching mechanism 86 that can be switched to a heat radiation state is provided.
[0030]
Then, the heat pump operation means K detects the low-pressure side refrigerant pressure by the gas engine 77, the electronic expansion valves 74 and 89, the indoor air-conditioning blower 76, the refrigerant compressor 78, the four-way valve 80, the outdoor air-conditioning blower 82, and the low-pressure side refrigerant pressure. Means 87, high-pressure detection means 88 for detecting the refrigerant pressure on the high-pressure side, and the like, and the cooling water circulation means L are the cooling water passage 85, the heating cooling water passage 91, the radiator pump P4, the radiator blower 84, the exhaust heat switching mechanism. 86, a cooling water temperature thermistor 95, and the like.
[0031]
The hot water storage unit control unit C and the heat pump operation control unit D are configured to be able to transmit and receive control signals such as that the engine heat pump air conditioner B is in an air conditioning operation and a drive request to the engine heat pump air conditioner B. As shown in FIG. 3, the air conditioning operation such as the air conditioning cooling operation and the air conditioning heating operation to the air conditioning target space based on the commands of the air conditioning remote controller 93 and the hot water storage remote controller 92 installed in each room as the air conditioning target space. , Such as hot water storage operation to store hot water in the hot water storage tank 1, heat radiation operation to dissipate heat in the external heat radiating unit 2, hot water supply priority operation to supply hot water when the hot water storage amount in the hot water storage tank 1 is less than the minimum secured amount, etc. Is configured to do.
[0032]
The operation of the engine heat pump air conditioner B will be described. When there is an air conditioning request such as an air conditioning cooling request or an air conditioning heating request from the air conditioning remote controller 93, the heat pump operation control unit D operates the heat pump operating means K and the cooling water circulation means L. The compressor 78 is operated by the gas engine 77 based on the air-conditioning request by the air-conditioning remote controller 93, and the air-conditioning cooling operation and the air-conditioning heating operation are selectively switched by the switching operation of the four-way valve 80. The heat pump operation means K is controlled by switching the air conditioning to each air conditioning target space by opening / closing control of the valve 74.
[0033]
That is, when there is an air conditioning cooling request from the air conditioning remote controller 93, the heat pump operation control unit D opens the electronic expansion valve 74 corresponding to the room with the air conditioning cooling request, and causes the indoor heat exchanger 75 to function as an evaporator. Then, the temperature of the air supplied to the air-conditioning target space is adjusted to a cooling temperature, and the heat pump operation means K is controlled to execute the air-conditioning cooling operation so that the outdoor heat exchanger 81 functions as a condenser and dissipates heat to the outside air. .
Further, when there is an air conditioning heating request from the air conditioning remote controller 93, the heat pump operation control unit D opens the electronic expansion valve 74 corresponding to the room with the air conditioning heating request, and causes the indoor heat exchanger 75 to function as a condenser. Then, the temperature of the air supplied to the air conditioning target space is adjusted by heating, and the heat pump operation means K is controlled to execute the air conditioning heating operation so that the outdoor heat exchanger 81 functions as an evaporator and absorbs heat from the outside air.
[0034]
The heat pump operation control unit D determines the rotational speed of the refrigerant compressor 78, the detected refrigerant pressure and the set target pressure so that the refrigerant pressure becomes the set target pressure in both the air conditioning cooling operation and the air conditioning heating operation. The time constant in the control is set to be sufficiently large, and the increase / decrease / change of the rotational speed is performed at a moderate speed.
[0035]
The cooling water circulation means L can be heated by the engine exhaust heat utilization type heater 34 by operating the radiator pump P4, operating the radiator blower 84 and radiating heat by the radiator 83 in the air conditioning cooling operation. Sometimes, when the cooling water flowing through the cooling water passage 85 becomes equal to or higher than the set temperature for heating, the exhaust heat switching mechanism 86 is switched to a heating state so that the cooling water is supplied to the engine exhaust heat utilization type heater 34. .
In the air-conditioning / heating operation, the radiator pump P4 is operated, the radiator blower 84 is operated and the radiator 83 dissipates heat, and when the engine exhaust heat utilizing heater 34 can be heated, the heating load is small. When the cooling water flowing through the cooling water passage 85 reaches the heating set temperature or higher, the exhaust heat switching mechanism 86 is switched to the heating state, and the cooling water is supplied to the engine exhaust heat utilization type heater 34.
[0036]
In the air-conditioning cooling operation, the indoor heat exchanger 75 functions as an evaporator to cool and adjust the temperature of air supplied to the air-conditioning target space, and the outdoor heat exchanger 81 functions as a condenser to radiate heat to the outside air. I am doing so.
In this air conditioning cooling operation, the heat pump operation control unit D controls the rotational speed of the gas engine 77 based on the detection information of the low pressure detection means 87 so that the detected pressure becomes the target pressure for cooling. .
Further, in the air conditioning and cooling operation, the heat pump operation control unit D switches the exhaust heat switching mechanism 86 to a heating state, supplies cooling water to the engine exhaust heat utilization type heater 34, and supplies hot water flowing through the circulation path 3 to the engine. Heat is exhausted.
[0037]
The flow of the refrigerant in the air-conditioning cooling operation will be described. The high-pressure dry vapor refrigerant discharged from the refrigerant compressor 78 is supplied to the outdoor heat exchanger 81 via the four-way valve 80, and the outdoor heat exchanger 81 It is condensed by heat exchange with the outside air.
Then, the condensing process passing refrigerant sent from the outdoor heat exchanger 81 is supplied to the indoor heat exchanger 75 via the electronic expansion valve 74, and is evaporated by heat exchange with the air to be cooled in the indoor heat exchanger 75. The
Thereafter, the low-pressure dry vapor refrigerant delivered from the indoor heat exchanger 75 is returned to the suction port of the refrigerant compressor 78 via the four-way valve 80 and the accumulator 79.
[0038]
In the air-conditioning / heating operation, the indoor heat exchanger 75 functions as a condenser to heat and control the temperature of air supplied to the air-conditioning target space, and the outdoor heat exchanger 81 functions as an evaporator to absorb heat from the outside air. ing.
In this air conditioning heating operation, the heat pump operation control unit D controls the rotational speed of the gas engine 77 based on the detection information of the high pressure detection means 88 so that the detected pressure becomes the target pressure for heating. .
In this air conditioning heating operation, the hot water flowing through the circulation path 3 is heated by the heating operation for supplying the high-pressure refrigerant to the heat pump heater 33 through the heating refrigerant pipe 90.
[0039]
When the flow of the refrigerant in the air conditioning heating operation is described, initial control is performed so that the electronic expansion valves 74 and 89 have a predetermined opening degree, and the detected pressure of the high pressure detecting means 88 becomes the target pressure. The rotational speed of the gas compressor 77 is increased or decreased to control the rotational speed of the refrigerant compressor 78, and the high-pressure dry vapor refrigerant discharged from the refrigerant compressor 78 is passed through the four-way valve 80 to the indoor heat exchanger 75 and the heat pump type. The heat is supplied to the heater 33 and condensed in the indoor heat exchanger 75 by heat exchange with the air to be heated, and in the heat pump heater 33, it is condensed by heat exchange with hot water in the circulation path 3.
[0040]
The condensation process passing refrigerant sent from the indoor heat exchanger 75 is supplied to the outdoor heat exchanger 81 via the electronic expansion valve 74, and the condensation process passing refrigerant sent from the heat pump heater 33 is The refrigerant is supplied to the outdoor heat exchanger 81 through the expansion valve 89 and is evaporated by heat exchange with the outside air in the outdoor heat exchanger 81.
Thereafter, the low-pressure dry vapor refrigerant sent from the outdoor heat exchanger 81 is returned to the suction port of the refrigerant compressor 78 via the four-way valve 80 and the accumulator 79.
[0041]
After the initial control of the electronic expansion valves 74 and 89 is completed, the refrigerant temperature on the downstream side of the indoor heat exchanger 75 and the heat pump heater 33 is detected by the refrigerant temperature sensor 96, and this detected temperature is the saturated liquid. Subcool control is performed to adjust the opening degree of the electronic expansion valves 74 and 89 so that the target temperature is obtained by subtracting a predetermined value from the temperature.
That is, in the subcool control, the indoor heat exchanger 75 or the heat pump heater 33 condenses and dissipates heat, and as a result, the temperature of the cooled refrigerant is detected by the refrigerant temperature sensor 96, and the detected temperature is detected as a high pressure. The opening degree of the electronic expansion valves 74 and 89 is adjusted to be lower by a predetermined value (subcool value) than the saturated liquid temperature obtained from data stored in advance in the memory based on the detected pressure detected by the means 88. .
[0042]
Then, the higher the temperature detected by the refrigerant temperature sensor 96 with respect to the target temperature obtained by subtracting a predetermined value from the saturated liquid temperature, the smaller the degree of opening of the electronic expansion valves 74 and 89, the lower the circulation amount of the refrigerant. Accordingly, the amount of heat released per predetermined amount of refrigerant increases, the temperature detected by the refrigerant temperature sensor 96 decreases, and the pressure detected by the high-pressure detection means 88 increases to increase the saturated liquid temperature, thereby increasing the refrigerant temperature sensor. The detected temperature by 96 can be made substantially equal to the target temperature.
Further, the lower the temperature detected by the refrigerant temperature sensor 96 with respect to the target temperature, the larger the degree of opening of the electronic expansion valves 74 and 89, thereby increasing the circulation amount of the refrigerant. The amount of heat release decreases, the temperature detected by the refrigerant temperature sensor 96 rises, the pressure detected by the high-pressure detection means 88 decreases, the saturated liquid temperature decreases, and the temperature detected by the refrigerant temperature sensor 96 is substantially the target temperature. Can be equivalent.
[0043]
The hot water storage unit control unit C is provided with hot water storage amount detection means M for detecting the amount of hot water stored in the hot water storage tank 1, target hot water storage amount setting means N for setting a target hot water storage amount to be stored in the hot water storage tank 1, and the like. Yes.
The hot water storage amount detection means M and the target hot water storage amount setting means N are provided in a program format, and the hot water storage amount detection means M detects a temperature of the hot water storage temperature thermistors S1, S2, S3, S4 that is equal to or higher than the hot water storage setting temperature Te. Depending on which hot water storage temperature thermistor S1, S2, S3, S4 is the lowest hot water storage temperature thermistor, an amount set in advance as an amount corresponding to the detection position of the hot water storage temperature thermistors S1, S2, S3, S4. The hot water is detected as a hot water storage amount, and the target hot water storage amount setting means N sets the hot water storage amount corresponding to one of the four hot water storage temperature thermistors S1, S2, S3, S4 as the target hot water storage amount. It is configured.
[0044]
Then, the hot water storage amount corresponding to the uppermost hot water storage temperature thermistor S1 is the minimum secured amount, the hot water storage amount corresponding to the second hot water storage temperature thermistor S2 is the small hot water storage amount, and the third hot water storage temperature thermistor S3 from the top. The corresponding hot water storage amount is set in advance as the intermediate hot water storage amount, and the hot water storage amount corresponding to the lowermost hot water storage temperature thermistor S4 is set in advance as the maximum hot water storage amount.
In the present embodiment, the minimum reserved amount is set to 17 liters, the small hot water storage amount is set to 30 liters, the intermediate hot water storage amount is set to 70 liters, and the maximum hot water storage amount is set to 113 liters.
[0045]
Next, the operation of the hot water storage unit A will be described. Based on the request command of the hot water remote controller 92, the operating state of the heat pump operation means K, etc., the hot water storage unit control unit C performs hot water circulation means E, circulation adjustment means F, hot water supply means. G, bath operation means H, heating operation means J, and auxiliary heater 34 are controlled to perform operations such as a hot water storage operation, a heat radiation operation, and a hot water supply priority operation.
[0046]
The hot water circulating means E will be described in detail. When the hot water circulating means E stores hot water in the hot water storage tank 1, the hot water hot water storage operation state (hereinafter referred to as HP hot water storage operation state), Switched between heat storage hot water operation state, auxiliary heating hot water storage operation state, heat pump hot water initial operation state as hot water initial operation state (hereinafter referred to as HP hot water initial operation state), exhaust heat hot water initial operation state, and auxiliary heating hot water initial operation state When the heat is radiated by the external heat radiating unit 2, the external heat radiating unit 2, while storing hot water in the hot water storage tank 1, as the heat radiating operation state, the heating independent operation state, the heating single operation state, the reheating / heating simultaneous operation state It is configured to be able to switch to each of the hot water storage and heat radiation parallel operation states for radiating heat.
[0047]
When hot water is stored in the hot water storage tank 1, when the temperature of the hot water heated by the heat pump heater 33, the engine exhaust heat utilization heater 34 or the auxiliary heater 35 is less than the allowable hot water storage temperature, Switch to the initial operation state, the waste heat storage hot water initial operation state or the auxiliary heating hot water storage initial operation state to circulate the hot water in the hot water storage tank 1 to the heat pump heater 33, the engine exhaust heat utilization heater 34 or the auxiliary heater 35. When the temperature of the heated hot water reaches the hot water storage allowable temperature, the hot water storage operation is switched to the HP hot water storage operation state, the exhaust heat hot water storage operation state, or the auxiliary heating hot water storage operation state, and hot water is stored in the hot water storage tank 1.
[0048]
Further, when heat is radiated by the external heat radiating unit 2, if there is only a request for additional heating, the mode is switched to the additional mode of independent operation. If there are both requests for heating, the system switches to the reheating / heating simultaneous operation state.If hot water is supplied with the hot water storage amount below the minimum required amount during the reheating independent operation, Switch to the simultaneous operation mode for hot water, and if hot water is supplied while the amount of hot water stored is less than the minimum required amount during single heating operation, switch to the hot water storage / heating simultaneous operation state as the hot water storage heat dissipation parallel operation state, and reheating / heating simultaneous operation When the hot water is supplied in a state where the amount of stored hot water is less than the minimum ensured amount, the hot water storage / heat dissipation parallel operation state is switched to the hot water storage / reheating / heating simultaneous operation state.
[0049]
Hereinafter, each state of the hot water circulating means E will be described.
In the description of each state of the hot water circulating means E, the upper on-off valve 28, the return on-off valve 29, the heating on-off valve 44, the bath on-off valve 45, the heat pump on-off valve 60, the auxiliary intermittent on-off valve 63, Regarding the open / closed states of the heat pump bypass open / close valve 69 and the auxiliary bypass open / close valve 70, only the open / close valve to be opened is described, and the open / close valves not described are closed.
[0050]
In the HP hot water storage operation state, the upper on-off valve 28 and the auxiliary bypass on-off valve 70 are opened and the circulation pump P1 is operated so that the hot water forms a temperature stratification in the hot water storage tank 1 and stores the hot water. After the hot water taken out from the bottom of the tank 1 is heated by the heat pump heater 33, the hot water bypasses the auxiliary heater 35 and is returned to the upper part of the hot water storage tank 1.
[0051]
In the exhaust heat storage operation state, the upper on-off valve 28 and the auxiliary bypass on-off valve 70 are opened, and the circulation pump P1 is operated so that hot water forms a temperature stratification in the hot water storage tank 1 and stores hot water. After the hot water taken out from the bottom of the hot water storage tank 1 is heated by the engine exhaust heat utilization type heater 34, the hot water bypasses the auxiliary heater 35 and is returned to the upper part of the hot water storage tank 1.
[0052]
In the auxiliary heating hot water storage operation state, the upper on-off valve 28 and the auxiliary intermittent on-off valve 63 are opened, and the circulation pump P1 is operated so that hot water forms a temperature stratification in the hot water storage tank 1 to store hot water. After the hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35, the hot water is returned to the upper part of the hot water storage tank 1.
[0053]
In the HP hot water storage initial state, the return on / off valve 29, the heating on / off valve 44, and the auxiliary bypass on / off valve 70 are opened, the circulation pump P1 is operated, and the hot water taken out from the bottom of the hot water storage tank 1 is heated by heat pump heating. After heating in the vessel 33, the hot water is bypassed the auxiliary heater 35 and returned to the bottom of the hot water storage tank 1.
[0054]
In the exhaust heat hot water storage initial operation state, the return on / off valve 29, the heating on / off valve 44, and the auxiliary bypass on / off valve 70 are opened, and the circulation pump P1 is operated to supply hot water taken out from the bottom of the hot water storage tank 1 to the engine. After being heated by the waste heat utilization type heater 34, the hot water is bypassed the auxiliary heater 35 and returned to the bottom of the hot water storage tank 1.
[0055]
In the auxiliary heating hot water storage initial operation state, the return on / off valve 29, the heating on / off valve 44, and the auxiliary on / off valve 63 are opened, and the circulation pump P1 is operated so that hot water taken out from the bottom of the hot water storage tank 1 is discharged. After heating with the auxiliary heater 35, the hot water is returned to the bottom of the hot water storage tank 1.
[0056]
In the reheating single operation state, when the heat pump heater 33 heats, the bath on-off valve 45, the heat pump on-off valve 60, and the auxiliary bypass on-off valve 70 are opened, and the circulation pump P1 is operated. The total amount of hot water heated by the heat pump heater 33 is radiated by the heat exchanger 43 for bath, and then the total amount of hot water that has passed through the heat exchanger 43 for bath bypasses the hot water storage tank 1. When returning to the heat pump heater 33 and heating with the auxiliary heater 35, the bath on-off valve 45, auxiliary on-off on-off valve 63 and heat pump bypass on-off valve 69 are opened and the circulation pump P1 is operated. After the total amount of hot water heated by the auxiliary heater 35 is radiated by the heat exchanger 43 for bath, the total amount of hot water that has passed through the heat exchanger 43 for bath is stored. Bypassing the tank 1 and the heat pump type heater 33 is returned to the auxiliary heater 35.
[0057]
In the heating independent operation state, the heating on-off valve 44, the auxiliary intermittent on-off valve 63, and the heat pump bypass on-off valve 69 are opened, the circulation pump P1 is operated, and the hot water heated by the auxiliary heater 35 is opened. After the total amount is radiated by the heating heat exchanging unit 42, the total amount of hot water that has passed through the heating heat exchanging unit 42 is returned to the auxiliary heater 35 bypassing the hot water storage tank 1 and the heat pump heater 33. I have to.
In the reheating / heating simultaneous operation state, the heating on / off valve 44, the bath on / off valve 45, the auxiliary intermittent on / off valve 63 and the heat pump bypass on / off valve 69 are opened, and the circulation pump P1 is operated to perform auxiliary heating. Hot water that has passed through the bath heat exchanging unit 43 and the heating heat exchanging unit 42 after radiating the total amount of hot water heated by the vessel 35 in the heat exchanging unit 43 for bath and the heat exchanging unit 42 for heating The total amount of this is bypassed the hot water storage tank 1 and the heat pump heater 33 and returned to the auxiliary heater 35.
[0058]
In the hot water storage and reheating simultaneous operation state, the upper on-off valve 28, the bath on-off valve 45, the auxiliary on-off on-off valve 63 and the heat pump bypass on-off valve 69 are opened, and the circulation pump P1 is operated to turn on the auxiliary heater. After the hot water heated at 35 is distributed and supplied to the hot water storage tank 1 and the bath heat exchanging portion 43, the hot water supplied to the bath heat exchanging portion 43 is dissipated while the hot water is stored in the upper portion of the hot water storage tank 1. The total amount of hot water that has passed through the heat exchanger 43 for the bath bypasses the hot water storage tank 1 and the heat pump heater 33 and is returned to the auxiliary heater 35 in a state where it is merged with the hot water taken out from the bottom of the hot water storage tank 1. I am doing so.
[0059]
In the hot water storage / heating simultaneous operation state, the upper on-off valve 28, the heating on-off valve 44, the auxiliary intermittent on-off valve 63 and the heat pump bypass on-off valve 69 are opened, and the circulation pump P1 is operated to turn on the auxiliary heater 35. After the hot water heated in the above is distributed and supplied to the hot water storage tank 1 and the heat exchange unit 42 for heating, and the hot water supplied to the heat exchange unit 42 for heating is dissipated while storing the hot water in the upper part of the hot water storage tank 1, The total amount of hot water that has passed through the heating heat exchanging section 42 bypasses the hot water storage tank 1 and the heat pump heater 33 and is returned to the auxiliary heater 35 in a state where it merges with the hot water taken out from the bottom of the hot water storage tank 1. I have to.
[0060]
In the hot water storage / reheating / heating simultaneous operation state, the upper on / off valve 28, the heating on / off valve 44, the bath on / off valve 45, the auxiliary intermittent on / off valve 63 and the heat pump bypass on / off valve 69 are opened, and the circulation pump P1 is operated, and hot water heated by the auxiliary heater 35 is distributed and supplied to the hot water storage tank 1, the heating heat exchanging unit 42 and the bath heat exchanging unit 43, and hot water is stored in the upper part of the hot water tank 1. After the hot water supplied to the heating heat exchanging unit 42 and the bath heat exchanging unit 43 is radiated, the entire amount of hot water passing through the heating heat exchanging unit 42 and the bath heat exchanging unit 43 is transferred to the hot water storage tank 1. The heat pump heater 33 is bypassed and returned to the auxiliary heater 35 in a state where it is joined to the hot water taken out from the bottom of the hot water storage tank 1.
[0061]
The control operation of the hot water storage unit A will be described based on the flowcharts of FIGS.
As shown in the flowchart of FIG. 4, the hot water storage unit A executes hot water supply priority operation when the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount and the hot water tap is opened and hot water is being supplied. If the amount of hot water stored in the hot water storage tank 1 is not less than the minimum ensured amount or not hot water is being supplied, if the hot water supply priority operation is being executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped. Perform priority operation stop processing.
When there is a heat release request such as a heating request or a renewal request, a heat release operation is executed. When there is a hot water storage request, a hot water storage operation is executed, and the engine heat pump air conditioner B is in operation and recovers engine exhaust heat. If the temperature of the cooled water is equal to or higher than the predetermined temperature, the exhaust heat hot water storage operation is executed.
[0062]
The hot water supply priority operation is executed when hot water is supplied to a hot water tap or the like when the amount of hot water stored in the hot water storage tank 1 is less than the minimum ensured amount, and the hot water circulation means E is switched to the auxiliary heating hot water storage operation state. While the hot water heated in this way is supplied from the upper connection path 25 to the hot water supply path 6, the temperature of the hot water to be supplied becomes the hot water supply target temperature based on the detection information of the hot water supply temperature, the hot water storage outlet thermistor 13 and the hot water supply thermistor 9. In addition, the opening degree of the mixing valve 8 is adjusted, and the opening degree of the mixing valve 8 is finely adjusted based on the deviation between the detected temperature and the hot water supply target temperature based on the detection information of the mixing thermistor 14. Hot water is supplied at a high temperature.
[0063]
By the way, when hot water is filled in the bathtub, similar to hot water supply priority operation, it is executed when hot water is stored in a hot water tap or the like when the amount of hot water stored in the hot water storage tank 1 is less than the minimum ensured amount. 13 and the detection information of the water supply thermistor 9, the opening of the mixing valve 8 is adjusted so that the temperature of the hot water to be supplied becomes the hot water supply target temperature, and the detection temperature and the detected temperature are determined based on the detection information of the mixing thermistor 14. While finely adjusting the opening of the mixing valve 8 based on the deviation from the hot water supply target temperature, the hot water solenoid valve 22 is opened, and the hot water adjusted to the hot water supply target temperature by the mixing bubble 8 is supplied to the bath return path 18 and Supplying to the bathtub from both sides of the bath going-out path 19 and when a set amount of hot water is supplied into the bathtub, the hot water solenoid valve 22 is closed. .
[0064]
When the control operation of the heat radiation operation is described based on the flowchart of FIG. 5, the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount, and the hot water tap is opened and hot water is being supplied. Execute hot water supply priority operation.
If the amount of hot water stored in the hot water storage tank 1 is equal to or greater than the minimum ensured amount or if hot water is not being supplied, if the hot water supply priority operation is executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped and the hot water supply priority operation is performed. Execute stop processing.
[0065]
When there is a renewal request and there is no heating request, a renewal operation is executed. When requested, the heating operation is executed.
In this way, depending on whether one or both of the renewal request and the heating request is requested, each of the renewal operation, the heating operation, the renewal / heating operation is executed and the additional operation is performed. When either or both of the burning request and the heating request are satisfied and the request is completed, a heat radiation stop process for stopping the operation of the hot water circulating means E and the auxiliary heater 35 is executed.
[0066]
As shown in the flowchart of FIG. 6, the reheating operation is performed when the hot water tap is opened and hot water is being supplied, and when the amount of hot water stored in the hot water storage tank 1 is less than the minimum secured amount, However, if the amount of stored hot water is not less than the minimum amount even when hot water is not being supplied, the chasing single operation is executed.
In the heating operation, as shown in the flowchart of FIG. 7, if the hot water tap is opened and hot water is being supplied, and the amount of hot water stored in the hot water storage tank 1 is less than the minimum reserved amount, the hot water storage and heating simultaneous operation is executed. When hot water is not being supplied, or even during hot water supply, if the amount of stored hot water is equal to or greater than the minimum ensured amount, the heating single operation is executed.
In the reheating / heating operation, as shown in the flowchart of FIG. 8, if the hot water tap is opened and hot water is being supplied and the amount of hot water stored in the hot water storage tank 1 is less than the minimum reserved amount, hot water storage / reheating / heating is performed. Simultaneous operation is executed. When hot water is not being supplied, or even when hot water is being supplied, if the amount of stored hot water is equal to or greater than the minimum ensured amount, simultaneous heating and heating operation is executed.
[0067]
The reheating isolated operation will be specifically described. The hot water circulation means E is switched to the retreating independent operation state, and the rotation speed and gas of the fan 37 are set so that the temperature detected by the hot water storage thermistor 66 becomes the reheating set temperature. While adjusting the opening degree of the proportional valve 40, the bath pump P3 is operated to circulate hot water in the bathtub through the bath return path 18 and the bath going path 19.
Then, the hot water in the bathtub is heated and chased by the bath heat exchanging unit 43, and when the detected temperature of the bath return thermistor 57 becomes equal to or higher than the chasing temperature, the operation of the bath pump P3 is stopped. The operation of the heater 35 and the hot water circulation means E are stopped.
[0068]
The heating single operation will be specifically described. The hot water circulation means E is switched to the heating single operation state, and the rotation speed of the fan 37 and the gas proportional valve 40 are set so that the temperature detected by the hot water storage thermistor 66 becomes the heating set temperature. And the heating pump P2 is operated to circulate the heat medium from the heating terminal through the heating return path 46 and the heating forward path 47, and the heating medium is heated by the heating heat exchanging section 42 for heating. Supply to the terminal.
[0069]
The reheating / heating simultaneous operation will be specifically described. The hot water circulation means E is switched to the reheating / heating simultaneous operation state, and the temperature detected by the hot water storage thermistor 66 becomes the setting temperature for reheating / heating simultaneous. While adjusting the rotation speed of the fan 37 and the opening degree of the gas proportional valve 40, the bath pump P3 is operated to circulate hot water in the bathtub through the bath return path 18 and the bath going path 19, and the heating pump P2 is operated. The heating medium from the heating terminal is circulated through the heating return path 46 and the heating outbound path 47.
And while chasing the hot water of a bathtub, the heating medium heated in the heat exchanging part 42 for heating is supplied to a heating terminal.
[0070]
As shown in the flowchart of FIG. 9, the hot water storage and reheating simultaneous operation switches the hot water circulation means E to the hot water reheating and simultaneous operation state, operates the circulation pump P1, and operates the bath pump P3. The hot water in the inside is circulated through the bath return path 18 and the bath going-out path 19 (steps # 1 to # 3).
And the auxiliary heater 35 is output at a constant output (340 kcal / min (about 1.43 × 10 ⁶ J / min)), the opening of the water proportional valve 65 is adjusted so that the circulating amount becomes the circulating amount at which the temperature detected by the hot water storage thermistor 66 becomes the hot water storage allowable temperature Tb, and the upper on-off valve 28 and the bath The on-off valve 45 is opened and closed periodically according to the additional load, that is, so that the proportion of the opening time of the on-off valve 45 for the bath increases as the additional load increases. By operation, hot water heated by the auxiliary heater 35 is distributed and supplied to the hot water storage tank 1 and the heat exchanger 43 for bath (steps # 4 and # 5).
When the temperature of the hot water supplied to the upper part of the hot water storage tank 1, that is, the temperature Ta detected by the hot water storage thermistor 66 is lower than the hot water storage allowable temperature Tb, the upper opening / closing valve 28 is closed and heated by the auxiliary heater 35. The hot water is supplied to the bath heat exchanging unit 43, and the operation of the hot water circulating means E in the hot water storage and heat radiation parallel operation state is controlled in a state where priority is given to the follow-up single operation (step #). 6, # 7).
[0071]
In the hot water storage / heating simultaneous operation, as shown in the flowchart of FIG. 10, the hot water circulation means E is switched to the hot water storage / heating simultaneous operation state, the circulation pump P1 is operated, and the heating pump P2 is operated to start from the heating terminal. Is circulated through the heating return path 46 and the heating outbound path 47 (steps # 11 to # 13).
Then, the auxiliary heater 35 is output at a constant output (340 kcal / min (about 1.43 × 10 ⁶ J / min)), the opening of the water proportional valve 65 is adjusted so that the circulating amount becomes a circulating amount at which the temperature detected by the hot water storage thermistor 66 becomes the hot water storage allowable temperature Tb, and the upper on-off valve 28 and the heating are adjusted. The on-off valve 44 is opened or closed periodically according to the heating load, that is, so that the ratio of the opening time of the heating on-off valve 44 increases as the heating load increases. Then, the hot water heated by the auxiliary heater 35 is distributed and supplied to the hot water storage tank 1 and the heating heat exchanger 42 (steps # 14 and # 15).
When the temperature of the hot water supplied to the upper part of the hot water storage tank 1, that is, the detected temperature Ta by the hot water storage thermistor 66 is lower than the hot water storage allowable temperature Tb, the upper on-off valve 28 is closed and heated by the auxiliary heater 35. The total amount of the hot water is supplied to the heating heat exchanging unit 42, and the operation of the hot water circulation means E in the hot water storage and heat radiation parallel operation state is controlled in a state where priority is given to the single heating operation (step # 16). , # 17).
[0072]
In the hot water storage / reheating / heating simultaneous operation, as shown in the flowchart of FIG. 11, the hot water circulation means E is switched to the hot water storage / reheating / heating simultaneous operation state to operate the circulation pump P1, and the bath pump P3 is turned on. The hot water in the bathtub is circulated through the bath return path 18 and the bath going-out path 19, and the heating pump P2 is operated to circulate the heat medium from the heating terminal through the heating return path 46 and the heating going-out path 47 (step #). 21- # 23).
Then, the auxiliary heater 35 is output at a constant output (340 kcal / min (about 1.43 × 10 ⁶ J / min)), the opening degree of the water proportional valve 65 is adjusted so that the circulation amount becomes a circulation amount at which the temperature detected by the hot water storage thermistor 66 becomes the hot water storage permission temperature Tb, and the upper on-off valve 28; The open / close valve 45 for the bath and the open / close valve 44 for the heating are set according to the total load of the tracking load and the heating load, that is, the larger the total load, the longer the opening time of the open / close valve 45 for the bath and the open / close valve 44 for the heating. The hot water heated by the auxiliary heater 35 is heated by the auxiliary heater 35 by the open / close valve opening / closing operation so that the ratio increases periodically, and the hot water storage tank 1, the heating heat exchanging unit 42, the bath heat exchanging unit 43, (Steps # 24 and # 25).
When the temperature of the hot water supplied to the upper part of the hot water storage tank 1, that is, the detected temperature Ta by the hot water storage thermistor 66 is lower than the hot water storage allowable temperature Tb, the upper on-off valve 28 is closed and heated by the auxiliary heater 35. The total amount of hot and cold water is supplied to the heating heat exchanging unit 42 and the bath heat exchanging unit 43 to control the operation of the hot water circulation means E in the hot water storage and heat radiation parallel operation state in a state where priority is given to the simultaneous operation of reheating and heating. (Steps # 26 and # 27).
[0073]
When the control operation of the hot water storage operation is described based on the flowchart of FIG. 12, when the hot water storage amount of the hot water storage tank 1 is less than the minimum ensured amount and the hot water tap is opened and hot water is being supplied, Execute hot water supply priority operation.
If the amount of hot water stored in the hot water storage tank 1 is equal to or greater than the minimum ensured amount or if hot water is not being supplied, if the hot water supply priority operation is executed, the operation of the auxiliary heater 35 and the operation of the circulation pump P1 are stopped and the hot water supply priority operation is performed. Execute stop processing.
When there is a heat release request for either a renewal request or a heating request, a heat release operation is executed. When there is no heat release request, hot water storage operation control is executed, and the amount of hot water stored in the hot water storage tank 1 becomes the target hot water storage amount. After the hot water storage in the hot water storage tank 1 is continued for a set time, the operation of the engine heat pump air conditioner B or the heating unit 4 is stopped, the operation of the circulation pump P1 is stopped, and the open / close valve is closed. Then, the hot water storage operation stop process for stopping the operation of the hot water circulation means E is executed.
[0074]
The hot water storage operation control is executed by selecting either a heat pump hot water storage operation (hereinafter referred to as an HP hot water storage operation) or an auxiliary heating hot water storage operation depending on whether the engine heat pump air conditioner B is in an air conditioning heating operation. If there is a hot water storage request as a heating request commanded from the hot water storage remote control 92 during the air conditioning heating operation of the engine heat pump type air conditioner B, the auxiliary heating priority is given by executing the auxiliary heating hot water storage operation in which the auxiliary heater 35 is operated to store hot water. If there is a hot water storage request when the engine heat pump air conditioner B is not in the air conditioning heating operation, the HP heat storage operation is performed to store the hot water in the air conditioner heating operation of the engine heat pump air conditioner B. Is configured to run.
[0075]
Then, when there is a hot water storage request in a state in which the air conditioning heating request from the air conditioning remote controller 93 is canceled during the air conditioning heating operation of the engine heat pump air conditioning apparatus B, the HP hot water storage operation is continued while the operation of the engine heat pump air conditioning apparatus B is continued. Is configured to run.
In addition, if there is an air conditioning heating request to the engine heat pump air conditioner B during the HP hot water storage operation, the HP hot water storage operation is continued based on the rotational speed of the gas engine 77 or the heating load of the room where the heating is requested. It is determined whether the air conditioning capacity of the engine heat pump type air conditioner B with the air conditioning load is sufficient or insufficient with respect to the air conditioning load. When the air conditioning capacity is sufficient, the HP hot water storage operation is continued and the engine When the air conditioning operation is performed by the heat pump type air conditioner B and the air conditioning capacity is insufficient, the HP hot water storage operation is switched to the auxiliary heating hot water storage operation and the engine heat pump type air conditioner B is operated. It is configured as follows.
[0076]
The HP hot water storage operation in the hot water storage operation will be described in detail. First, the engine heat pump air conditioner B is heated to supply high-pressure refrigerant to the heat pump heater 33, and the hot water circulating means E is in the HP hot water storage initial operation state. The hot water in the hot water storage tank 1 is heated by the heat pump heater 33.
When the temperature detected by the hot water storage thermistor 66 exceeds the hot water storage allowable temperature, the hot water circulating means E is switched from the HP hot water storage initial operation state to the HP hot water storage operation state, and the temperature of hot water stored in the upper part of the hot water storage tank 1 is increased. Is adjusted based on detection information of the hot water storage thermistor 66 so that the opening degree of the water proportional valve for circulation 65 is adjusted.
[0077]
In this way, when the hot water in the hot water storage tank 1 is stored while forming temperature stratification, and the hot water storage amount of the hot water storage tank 1 reaches the target hot water storage amount set by the hot water remote control 92 or the like, the hot water storage in the hot water storage tank 1 for a set time is performed. Then, the operation of the engine heat pump type air conditioner B is stopped, the operation of the circulation pump P1 is stopped, and the open / close valve is closed to stop the operation of the hot water circulation means E.
Incidentally, the target hot water storage amount can be selected from one of “small”, “medium”, and “full”. For example, when “medium” is selected as the target hot water storage amount, the central thermistor S3 is set at the hot water storage set temperature. If a temperature lower than the set temperature is detected, it is detected that the amount of hot water stored in the hot water storage tank 1 is equal to the target hot water storage amount.
[0078]
The auxiliary heating hot water storage operation in the hot water storage operation will be specifically described. First, the hot water circulating means E is switched to the auxiliary heating hot water storage initial operation state, and the hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35. After that, the auxiliary heating hot water initial operation for returning the hot water to the bottom of the hot water storage tank 1 and the hot water circulation means E are switched to the auxiliary heating hot water storage operation state, and the hot water taken out from the bottom of the hot water storage tank 1 is heated by the auxiliary heater 35. After that, the hot water is switched to the auxiliary heating hot water storage operation in which the hot water is supplied to the upper part of the hot water storage tank 1 and stored.
[0079]
That is, the hot water storage unit controller C determines that the boiling temperature Ta exceeding the temperature 8 ° C. higher than the hot water storage target temperature Tb or the boiling temperature Ta exceeding 15 ° C. lower than the hot water storage target temperature Tb is the hot water storage thermistor 66. Until the temperature is detected continuously for 1 second, the auxiliary heating hot water storage initial operation is performed in which the hot water is circulated at the circulation amount Q of 1 liter / min in the auxiliary heating hot water storage initial operation state, which is 8 ° C. higher than the hot water storage target temperature Tb When the boiling temperature Ta exceeding the temperature or the boiling temperature Ta exceeding 15 ° C. lower than the hot water storage target temperature Tb is continuously detected for 1 second, the heating temperature is switched to the auxiliary heating hot water storage operation state. The circulation amount Q is controlled so that Ta becomes the hot water storage target temperature Tb.
[0080]
In this way, when the hot water in the hot water storage tank 1 is stored while forming temperature stratification, and the hot water storage amount of the hot water storage tank 1 reaches the target hot water storage amount set by the hot water remote control 92 or the like, the hot water storage in the hot water storage tank 1 for a set time is performed. Then, the operation of the auxiliary heater 35 is stopped, the operation of the circulation pump P1 is stopped, and the open / close valve is closed to stop the operation of the hot water circulation means E.
[0081]
The exhaust heat hot water storage operation is to store hot water using the engine exhaust heat during operation of the engine heat pump type air conditioner B, and the hot water taken out from the bottom of the hot water storage tank 1 is switched to the exhaust heat hot water storage initial operation state. After heating with the engine exhaust heat utilization type heater 34, the hot water is circulated in a form in which the hot water is returned to the bottom of the hot water storage tank 1, and the operation is switched between the exhaust heat hot water initial operation and the exhaust heat hot water operation state. Hot water taken out from the bottom is heated by the engine exhaust heat utilization type heater 34, and then the hot water is switched to the exhaust heat hot water storage operation in which hot water is circulated in a form in which the hot water is supplied to the upper part of the hot water storage tank 1.
[0082]
[Other Embodiments]
1. In the said embodiment, although the structure which distributes and supplies the hot water heated with the auxiliary heater to the hot water storage tank and the external heat radiating part was shown, the hot water heated using the heat pump type heater and the engine exhaust heat utilization type heater together Alternatively, hot water heated by a heat pump heater or an engine exhaust heat utilization heater may be distributed and supplied to the hot water storage tank and the external heat radiating section.
2. In the above-described embodiment, an external heat dissipating unit in which a plurality of heat exchanging units are connected in parallel is provided, and an on-off valve is provided on the upstream side for each heat exchanging unit. An external heat dissipating part connected in series may be provided, and an on-off valve may be provided upstream of the external heat dissipating part.
3. In the above-described embodiment, the configuration in which the operation of the hot water circulation means is controlled in the hot water storage heat radiation parallel operation state when the necessity of the hot water storage operation occurs in the heat radiation operation is described. The operation of the hot water circulation means may be controlled in the hot water storage heat radiation parallel operation state.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water storage type hot water supply heat source device (hot water storage unit).
FIG. 2 is a schematic configuration diagram of a hot water storage type hot water supply heat source device (engine heat pump type air conditioning unit)
FIG. 3 is a control block diagram.
FIG. 4 is a flowchart showing a control operation.
FIG. 5 is a flowchart showing a control operation.
FIG. 6 is a flowchart showing a control operation.
FIG. 7 is a flowchart showing a control operation.
FIG. 8 is a flowchart showing a control operation.
FIG. 9 is a flowchart showing a control operation.
FIG. 10 is a flowchart showing a control operation.
FIG. 11 is a flowchart showing a control operation.
FIG. 12 is a flowchart showing a control operation.
[Explanation of symbols]
1 Hot water storage tank
2 External heat dissipation part
4 Heating means
6 Hot water supply path
25 Hot water supply path for hot water storage
28 On-off valve
44 On-off valve
45 On-off valve
96 Hot water flow channel for heating
97 Heat Dissipation Hot Water Channel
98 Hot water passage for hot water storage
99 Hot water supply path for heat dissipation
C Control means
E Hot water circulation means
P1 Circulation pump
Ta hot water temperature
Tb hot water storage permission temperature

Claims

A hot water storage tank having a hot water supply channel connected to the top and a water supply channel for supplying water using tap water pressure connected to the bottom ;
The hot water taken out from the bottom of the hot water storage tank is heated by heating means so that the hot water is stored in the hot water storage tank by forming a temperature stratification, and then the hot water is supplied to the upper part of the hot water storage tank. The hot water storage operation state in which the hot water is circulated, the total amount of hot water heated by the heating means is supplied to the external heat radiating portion, and the total amount of hot water that has passed through the external heat radiating portion is bypassed the hot water storage tank to the heating means. Hot water circulation means that can be switched to a heat radiation operation state in which hot water is circulated in a direct return form,
A hot water storage type hot water supply heat source device provided with a control means for controlling the operation of the hot water circulation means,
The hot water circulating means distributes and supplies hot water heated by the heating means to the hot water storage tank and the external heat radiating section, and bypasses the hot water storage tank with the total amount of hot water passing through the external heat radiating section. It is configured to be freely switchable to a hot water storage heat radiation parallel operation state in which hot water is circulated in the form of returning directly to the heating means,
Hot water supply path for hot water storage connected to the hot water storage tank via the upstream side of the hot water supply path and supplying hot water heated by the heating means to the upper part of the hot water storage tank, and hot water heated by the heating means On / off valves are provided in each of the hot water supply passages for supplying heat to the external heat radiating section,
Hot water heated by the heating means by the control means periodically opening an on-off valve provided in the hot water supply passage for hot water storage and an on-off valve provided in the hot water supply passage for heat radiation. Is distributed to the hot water storage tank and the external heat radiating section to control the operation of the hot water circulating means in the hot water storage heat radiation parallel operation state.

A hot water circulation path for circulating hot water in the hot water storage operation state is a closed loop shape of a hot water flow path for hot water provided with the hot water storage tank in the middle and a hot water flow path for heating provided with the heating means and the circulation pump in the middle. Connected to and configured
The hot water flow path for heat dissipation provided in the middle of the external heat radiating portion is connected to the hot water storage circulation path in parallel with the hot water flow path for hot water storage,
Each of the hot water storage hot water supply path upstream of the hot water storage tank in the hot water storage hot water flow path, and the heat dissipation hot water supply path upstream of the external heat radiating portion of the heat dissipation hot water flow path. The on-off valve is provided,
The control means is configured to adjust the open / close state of the on-off valve to switch the operation state of the hot water circulation means to the hot water storage operation state, the heat dissipation operation state, and the hot water storage heat dissipation parallel operation state. The hot-water storage type hot-water supply heat source device according to claim 1.

When the temperature of the hot water supplied to the upper part of the hot water storage tank is lower than the hot water storage allowable temperature, the control means supplies the entire amount of hot water heated by the heating means to the external heat radiating unit, and the hot water storage heat dissipation parallel operation The hot water storage type hot water supply heat source device according to claim 1 or 2, configured to control operation of the hot water circulation means in a state.